Halloween Watch Sale: Seiko mods hand-assembled to order.

Build your custom watch with confidence.

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On their wrist. In their words.

Shop the Halloween watch sale.

Every Seiko mod for sale here is hand-assembled after you order, and every build costs under $400.

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Best Seiko mods to start with: our sale picks.

The best Seiko mod watches to start with, picked from what customers order and rate. Explore our automatic watches for men.

Easy first builds from our most popular watches.

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The watches most ordered from November 15 to December 24.

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Dress watches for men that work every day.

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GMT watches on sale. What is a GMT watch? A second time zone, read at a glance on the NH34 movement. NH34 GMT guide. Prices shown for the NH34 version.

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Popular picks: what customers order most, each under $300 in its base version.

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Movements, explained

Which movement is inside?

Most people wear one watch every day. Pick the function you will actually use on a normal Tuesday; the style comes after.

NH35 Automatic with date

Hours, minutes, seconds and a date window. The automatic movement winds itself as you wear it, and the seconds hand stops when you pull the crown, so you can set the time to the second.

Made for

  • Office days, meetings and travel
  • Dates on forms, tickets and invoices
  • One watch for everything

As your daily

The simplest daily: no battery to change and nothing extra to set. The date is there at a glance.

Popular picks

DATEJUST WATCH MOD TWO-TONE CHOCOLATE BROWN DIAL
DATEJUST WATCH MOD TWO-TONE CHOCOLATE BROWN DIAL
Regular price $290.00 USDReference price: $330.00 USD
DATEJUST WATCH MOD SILVER ARABIC OLIVE GREEN DIAL
DATEJUST WATCH MOD SILVER ARABIC OLIVE GREEN DIAL
Regular price $290.00 USDReference price: $330.00 USD
AQUANAUT WATCH MOD ORANGE DIAL
AQUANAUT WATCH MOD ORANGE DIAL
Regular price $290.00 USDReference price: $330.00 USD
Shop Datejust builds

NH34 Second time zone

A fourth hand goes round once a day on a 24-hour scale. Set it to home time or a colleague’s city, while the main hands keep showing where you are.

Made for

  • Calls and work across time zones
  • Travel without losing home time
  • Family or friends abroad

As your daily

It reads like a classic automatic with a date. The extra hand is there when you need it and easy to ignore when you do not.

Popular picks

GMT WATCH MOD BRUCE WAYNE DIAL
GMT WATCH MOD BRUCE WAYNE DIAL
Regular price $290.00 USDReference price: $330.00 USD
4.5 (8)
GMT WATCH MOD TWO-TONE BLACK DIAL
GMT WATCH MOD TWO-TONE BLACK DIAL
Regular price $290.00 USDReference price: $330.00 USD
GMT WATCH MOD PEPSI DIAL
GMT WATCH MOD PEPSI DIAL
Regular price $290.00 USDReference price: $330.00 USD
5.0 (2)
Shop GMT builds

VK63 Stopwatch

Two pushers start, stop and reset a stopwatch that measures up to 60 minutes. Quartz keeps the time, and the chronograph hands return to zero with a mechanical reset.

Made for

  • Timing a run, a workout or a lap
  • Parking, cooking or a presentation
  • The sporty look of subdials and pushers

As your daily

Quartz-regulated, so it keeps running even when it rests in a drawer for a week. Pick it up and go.

Popular picks

DAYTONA CHRONOGRAPH WATCH MOD ROSE GOLD BLACK DIAL RUBBER STRAP
DAYTONA CHRONOGRAPH WATCH MOD ROSE GOLD BLACK DIAL RUBBER STRAP
Regular price $285.00 USDReference price: $325.00 USD
4.5 (2)
DAYTONA CHRONOGRAPH WATCH MOD SILVER BLACK DIAL
DAYTONA CHRONOGRAPH WATCH MOD SILVER BLACK DIAL
Regular price $285.00 USDReference price: $325.00 USD
ROYAL OAK CHRONOGRAPH WATCH MOD SILVER PANDA DIAL
ROYAL OAK CHRONOGRAPH WATCH MOD SILVER PANDA DIAL
Regular price $285.00 USDReference price: $325.00 USD
4.0 (1)
Shop chronographs

NH38 No date, open heart

An automatic without a date window, so the dial stays clean. Open-heart and skeleton builds show the balance wheel at work through the dial.

Made for

  • Evenings and sharper outfits
  • Anyone who loves seeing the mechanism
  • A clean dial with nothing to correct

As your daily

Nothing to set at the end of a month: wear it and it winds itself.

Popular picks

NAUTILUS WATCH MOD ROSE GOLD CHOCOLATE OPEN HEART DIAL
NAUTILUS WATCH MOD ROSE GOLD CHOCOLATE OPEN HEART DIAL
Regular price $290.00 USDReference price: $330.00 USD
5.0 (4)
SANTOS WATCH MOD SILVER 9-5 WHITE DIAL
SANTOS WATCH MOD SILVER 9-5 WHITE DIAL
Regular price $290.00 USDReference price: $330.00 USD
5.0 (2)
SANTOS WATCH MOD TWO-TONE WHITE DIAL
SANTOS WATCH MOD TWO-TONE WHITE DIAL
Regular price $290.00 USDReference price: $330.00 USD
5.0 (2)
Shop open heart builds

8285 Day and date

The weekday and the date sit next to the time, driven by the Miyota 8285 automatic.

Made for

  • Busy weeks full of appointments
  • Business and formal wear
  • Anyone who wants more than a date

As your daily

The fullest calendar in the range: the day and the date, every morning at a glance. In 36, 39 or 41 mm.

Popular picks

DAYDATE WATCH MOD GOLD WHITE DIAL
DAYDATE WATCH MOD GOLD WHITE DIAL
Regular price $289.00 USDReference price: $329.00 USD
DAYDATE WATCH MOD TIFFANY DIAL
DAYDATE WATCH MOD TIFFANY DIAL
Regular price $289.00 USDReference price: $329.00 USD
DAYDATE WATCH MOD CHOCOLATE DIAL
DAYDATE WATCH MOD CHOCOLATE DIAL
Regular price $289.00 USDReference price: $329.00 USD
Shop Day-Date builds

How to choose a watch on sale.

Five checks that make a sale price worth it.

  1. Choose the function first.

    Date (NH35), a second time zone (NH34 GMT), a stopwatch (VK63 chronograph) or a view of the balance wheel (NH38 open heart).

    Compare movements ↑
  2. Then pick the style you will wear.

    From Datejust to Royal Oak, every style has its own page with every build.

    See all styles →
  3. Check size and bracelet.

    Look at case size and bracelet on the product page before you buy.

    Seiko mod buying guide →
  4. Count the full delivery time.

    4–6 business days to build, then 7–12 business days in transit.

  5. Check the return window.

    14 days, no reason needed. Return shipping is yours unless the watch is faulty.

    Refund policy

What every ModTime watch includes.

Delivery4–6 business days to build, then 7–12 in transit, fully tracked
Shipping + DutiesFree US shipping. Import costs included. Any applicable sales tax is shown at checkout.
Returns14-day returns, no reason needed.
In the boxTravel case and accessories.
IndependentAn independent custom watch studio, not affiliated with any watch brand.

Before you order

Buy with confidence.

Square black dial watch worn on a wrist
Silver chronograph watch worn on a wrist
Black chronograph-style sport watch worn on a wrist
Skeleton-dial sport watch worn outdoors
Silver square watch worn on a wrist
Three custom-style watches held in hand

From verified buyers

  • “Great watch. I love my GMT.”

    Stephen S. · Verified buyer

    ModTime Bruce Wayne GMT — 40 mm NH34 Automatic Watch

  • “Súper great quality, and also super great servive, by the vendor..,”

    Robert · Verified buyer

    SANTOS WATCH MOD TWO-TONE WHITE DIAL

  • Built for you, by hand

    Your watch is assembled by hand after you order, from parts prepared to fit as one design. Assembly takes 4–6 business days.

    How we build
  • Checked before it ships

    Function, alignment and finish are checked after assembly, before the watch leaves the studio.

    Quality check
  • 12 months covered

    The ModTime workshop warranty covers mechanical defects and assembly faults in everyday use. If something is not right, write to us and we help.

    Warranty
  • Pay the way you know

    Shop Pay, PayPal, Apple Pay, Google Pay or card, on Shopify’s encrypted checkout.

  • Free, tracked delivery

    Free US shipping and import costs included. Any applicable sales tax is shown at checkout. 4–6 business days to build, then 7–12 business days in transit.

    Shipping
  • Ask before you buy

    Not sure about the size, the dial or the movement? Write to us before you order and we help you choose.

    Contact

The Halloween watch sale, explained

Iconic designs. A movement you can trust.

Our Halloween watch sale covers the same builds as any other day: a proven Seiko-family movement, a case, dial and bracelet chosen part by part, and a watch assembled by hand after you order. The sale changes the price, not the build.

A Seiko mod is a watch built around a proven Seiko-family movement, such as the NH35 automatic, with the case, dial, hands, bezel and bracelet chosen to create a design you actually want to wear. What started as a collectors' hobby has become its own corner of watch culture.

ModTime is the independent studio that does the building for you. You choose the design; we assemble it by hand after your order, check it before it ships and back it with a 12-month warranty. Our watches are not made by, or affiliated with, Seiko or the watch houses whose designs inspire our styles.

  • 01 Choose your build

    Pick the style, dial and bracelet. Where the model offers it, choose the size, 3 or 5 ATM and a logo or clean dial.

    Logo or no logo 
  • 02 Parts prepared as one

    Case, dial, hands, crystal and bracelet are reviewed together before assembly, so the finished watch reads as one design.

    Materials 
  • 03 Assembled by hand

    The movement is seated, the dial and hands are fitted and aligned, the case is closed and the crown action is checked.

    How we build 
  • 04 Checked and shipped

    Function, alignment and finish get a final check. Assembly takes 4–6 working days; delivery then takes 7–12 days.

    Build timeline 
  • 904L steel

    Cases in 904L stainless steel, valued for corrosion resistance and a deep, even polish.

    Materials 
  • Sapphire crystal

    Scratch-resistant sapphire keeps the dial clear through everyday wear.

    Materials 
  • The right movement

    NH35 with date, NH38 without date or with an open heart, NH34 GMT, VK63 chronograph or Miyota 8285 day-date, matched to what the watch does.

    Movements 
  • 3 or 5 ATM

    3 ATM comes standard and 5 ATM is an option. Ready for rain and splashes, not for swimming.

    Water resistance 

Movements compared

Seiko mod movements at a glance.

Every ModTime product page names the movement in that exact watch. This is how the five compare.

Movement Type What it shows Built into
NH35 Automatic, winds as you wear it Hours, minutes, seconds and the date Datejust, Submariner, Nautilus, Royal Oak, Aquanaut, Yacht-Master, Sky-Dweller, Seamaster NH35 guide
NH38 Automatic, no date Hours, minutes and seconds; open-heart and skeleton dials show the balance wheel Santos, Oyster, open-heart Nautilus, skeleton and open-heart Royal Oak Open heart & skeleton
NH34 Automatic GMT A second time zone on a 24-hour hand, plus the date GMT, Explorer NH34 GMT guide
VK63 Meca-quartz chronograph The time, plus a stopwatch up to 60 minutes on two pushers Daytona, Speedmaster, Royal Oak chronograph VK63 guide
Miyota 8285 Automatic The time, the weekday and the date Day-Date, in 36, 39 or 41 mm Day-Date mods

NH34, NH35, NH38 and VK63 are made by TMI (Time Module), the movement maker of the Seiko group; the 8285 is made by Miyota. ModTime watches are independent builds, not official Seiko models.

ModTime Submariner-style Silver Kermit listing (NH35): silver-tone case, rotor marked NH35A, gloved rear view

Proof you can see

See what is inside.

Every product page names the movement in that exact watch, so you know what you are buying before you order. Where a build has a display caseback, the movement stays in view after assembly.

Have a question about one build? Ask us before you order.

Ask about a build

Shop by style

Seiko mods by style.

Every style we build, with its movement, size and the watches people choose most.

Seiko GMT mod

NH34 GMT · 40 mm

Seiko GMT mods run on the NH34 automatic GMT movement in a 40 mm case: a fourth hand tracks a second time zone against the 24-hour bezel. Pepsi, Batman, Sprite, Root Beer and more.

GMT WATCH MOD BRUCE WAYNE DIAL
GMT WATCH MOD BRUCE WAYNE DIAL
Regular price $290.00 USDReference price: $330.00 USD
4.5 (8)
GMT WATCH MOD TWO-TONE BLACK DIAL
GMT WATCH MOD TWO-TONE BLACK DIAL
Regular price $290.00 USDReference price: $330.00 USD
GMT WATCH MOD PEPSI DIAL
GMT WATCH MOD PEPSI DIAL
Regular price $290.00 USDReference price: $330.00 USD
5.0 (2)

Seiko Nautilus mod

NH35 date or NH38 open heart

Seiko Nautilus mods pair the integrated-bracelet sports design with the NH35 automatic and date, or the NH38 for open-heart dials. Blue, chocolate, Tiffany, green and rose-gold versions.

NAUTILUS WATCH MOD ROSE GOLD CHOCOLATE OPEN HEART DIAL
NAUTILUS WATCH MOD ROSE GOLD CHOCOLATE OPEN HEART DIAL
Regular price $290.00 USDReference price: $330.00 USD
5.0 (4)
NAUTILUS WATCH MOD SILVER TIFFANY BLUE DIAL
NAUTILUS WATCH MOD SILVER TIFFANY BLUE DIAL
Regular price $290.00 USDReference price: $330.00 USD
NAUTILUS WATCH MOD ROSE GOLD BROWN DIAL
NAUTILUS WATCH MOD ROSE GOLD BROWN DIAL
Regular price $290.00 USDReference price: $330.00 USD

Seiko Royal Oak mod

41 mm · automatic or chronograph

Seiko Royal Oak mods come in 41 mm with the octagonal bezel and integrated bracelet: NH35 with date, NH38 skeleton or open heart, or a VK63 chronograph.

ROYAL OAK WATCH MOD GOLD BLACK DIAL
ROYAL OAK WATCH MOD GOLD BLACK DIAL
Regular price $290.00 USDReference price: $330.00 USD
ROYAL OAK CHRONOGRAPH WATCH MOD SILVER PANDA DIAL
ROYAL OAK CHRONOGRAPH WATCH MOD SILVER PANDA DIAL
Regular price $285.00 USDReference price: $325.00 USD
4.0 (1)
ROYAL OAK WATCH MOD ROSE GOLD BLACK DIAL
ROYAL OAK WATCH MOD ROSE GOLD BLACK DIAL
Regular price $290.00 USDReference price: $330.00 USD
5.0 (1)

Seiko Daytona mod

VK63 chronograph · 40 mm

Seiko Daytona mods are 40 mm chronographs on the VK63 meca-quartz movement: panda, reverse panda, champagne and rose-gold dials, on a bracelet or a rubber strap.

DAYTONA CHRONOGRAPH WATCH MOD ROSE GOLD BLACK DIAL RUBBER STRAP
DAYTONA CHRONOGRAPH WATCH MOD ROSE GOLD BLACK DIAL RUBBER STRAP
Regular price $285.00 USDReference price: $325.00 USD
4.5 (2)
DAYTONA CHRONOGRAPH WATCH MOD SILVER BLACK DIAL
DAYTONA CHRONOGRAPH WATCH MOD SILVER BLACK DIAL
Regular price $285.00 USDReference price: $325.00 USD
DAYTONA CHRONOGRAPH WATCH MOD SILVER PANDA DIAL
DAYTONA CHRONOGRAPH WATCH MOD SILVER PANDA DIAL
Regular price $285.00 USDReference price: $325.00 USD
5.0 (2)

Seiko Santos mod

NH38 automatic · 38 mm

Seiko Santos mods have the 38 mm square case with exposed screws, Roman numerals and the NH38 no-date automatic, including skeleton dials.

SANTOS WATCH MOD SILVER 9-5 WHITE DIAL
SANTOS WATCH MOD SILVER 9-5 WHITE DIAL
Regular price $290.00 USDReference price: $330.00 USD
5.0 (2)
SANTOS WATCH MOD TWO-TONE WHITE DIAL
SANTOS WATCH MOD TWO-TONE WHITE DIAL
Regular price $290.00 USDReference price: $330.00 USD
5.0 (2)
SANTOS WATCH MOD SILVER GREEN DIAL
SANTOS WATCH MOD SILVER GREEN DIAL
Regular price $290.00 USDReference price: $330.00 USD
5.0 (1)

Seiko Datejust mod

NH35 · 36, 39 or 41 mm

Seiko Datejust mods combine the fluted bezel, a Jubilee or Oyster-style bracelet and the NH35 automatic with date, in 36, 39 or 41 mm at the same price.

DATEJUST WATCH MOD TWO-TONE CHOCOLATE BROWN DIAL
DATEJUST WATCH MOD TWO-TONE CHOCOLATE BROWN DIAL
Regular price $290.00 USDReference price: $330.00 USD
DATEJUST WATCH MOD SILVER ARABIC OLIVE GREEN DIAL
DATEJUST WATCH MOD SILVER ARABIC OLIVE GREEN DIAL
Regular price $290.00 USDReference price: $330.00 USD
DATEJUST WATCH MOD ROSE GOLD ROMAN CHOCOLATE BROWN DIAL
DATEJUST WATCH MOD ROSE GOLD ROMAN CHOCOLATE BROWN DIAL
Regular price $290.00 USDReference price: $330.00 USD

Seiko Submariner mod

NH35 automatic with date

Seiko Submariner mods have the rotating bezel and the NH35 automatic with date, from black and Kermit to Smurf, Hulk and two-tone root beer.

SUBMARINER WATCH MOD TWO-TONE NIGHT DIAL
SUBMARINER WATCH MOD TWO-TONE NIGHT DIAL
Regular price $290.00 USDReference price: $330.00 USD
SUBMARINER WATCH MOD SILVER BLACK DIAL
SUBMARINER WATCH MOD SILVER BLACK DIAL
Regular price $290.00 USDReference price: $330.00 USD
5.0 (1)
SUBMARINER WATCH MOD SILVER HULK DIAL
SUBMARINER WATCH MOD SILVER HULK DIAL
Regular price $290.00 USDReference price: $330.00 USD
5.0 (1)

Seiko Aquanaut mod

NH35 automatic · 41 mm

Seiko Aquanaut mods have the rounded 41 mm case on a rubber strap and the NH35 automatic with date, in orange, green, brown, blue and more.

AQUANAUT WATCH MOD ORANGE DIAL
AQUANAUT WATCH MOD ORANGE DIAL
Regular price $290.00 USDReference price: $330.00 USD
AQUANAUT WATCH MOD SILVER BLACK DIAL
AQUANAUT WATCH MOD SILVER BLACK DIAL
Regular price $290.00 USDReference price: $330.00 USD
AQUANAUT WATCH MOD ROSE GOLD-TONE CASE BLACK DIAL
AQUANAUT WATCH MOD ROSE GOLD-TONE CASE BLACK DIAL
Regular price $290.00 USDReference price: $330.00 USD
5.0 (1)

Seiko Yacht-Master mod

NH35 automatic with date

Seiko Yacht-Master mods pair the raised bezel with grey, black or rose-gold details and the NH35 automatic with date, on a bracelet or a rubber strap.

YACHTMASTER WATCH MOD TWO-TONE ROSE GOLD DIAL
YACHTMASTER WATCH MOD TWO-TONE ROSE GOLD DIAL
Regular price $290.00 USDReference price: $330.00 USD
YACHTMASTER WATCH MOD GREY DIAL
YACHTMASTER WATCH MOD GREY DIAL
Regular price $290.00 USDReference price: $330.00 USD
5.0 (1)
YACHTMASTER WATCH MOD BLACK DIAL RUBBER STRAP
YACHTMASTER WATCH MOD BLACK DIAL RUBBER STRAP
Regular price $290.00 USDReference price: $330.00 USD

Seiko Seamaster mod

NH35 automatic with date

The Seiko Seamaster mod is a blue-dial sports build on the NH35 automatic with date.

SEAMASTER WATCH MOD SILVER BLUE DIAL
SEAMASTER WATCH MOD SILVER BLUE DIAL
Regular price $290.00 USDReference price: $330.00 USD
SEAHORSE WATCH MOD SILVER BLACK DIAL
SEAHORSE WATCH MOD SILVER BLACK DIAL
Regular price $290.00 USDReference price: $330.00 USD
4.5 (2)

Seiko Oyster mod

Clean dial · 36, 39 or 41 mm

Seiko Oyster mods keep the dial clean and bright: yellow, sky blue, bubblegum, green or white, mostly on the NH38 no-date automatic, in 36, 39 or 41 mm.

OYSTER WATCH MOD SKY BLUE DIAL
OYSTER WATCH MOD SKY BLUE DIAL
Regular price $289.00 USDReference price: $329.00 USD
OYSTER WATCH MOD YELLOW DIAL
OYSTER WATCH MOD YELLOW DIAL
Regular price $289.00 USDReference price: $329.00 USD
OYSTER WATCH MOD WHITE DIAL
OYSTER WATCH MOD WHITE DIAL
Regular price $289.00 USDReference price: $329.00 USD

Seiko Day-Date mod

Miyota 8285 · 36, 39 or 41 mm

Seiko Day-Date mods show the weekday and the date on the Miyota 8285 automatic, with chocolate, olive, Tiffany and white dials, in 36, 39 or 41 mm.

DAYDATE WATCH MOD GOLD WHITE DIAL
DAYDATE WATCH MOD GOLD WHITE DIAL
Regular price $289.00 USDReference price: $329.00 USD
DAYDATE WATCH MOD TIFFANY DIAL
DAYDATE WATCH MOD TIFFANY DIAL
Regular price $289.00 USDReference price: $329.00 USD
DAYDATE WATCH MOD CHOCOLATE DIAL
DAYDATE WATCH MOD CHOCOLATE DIAL
Regular price $289.00 USDReference price: $329.00 USD

Seiko Sky-Dweller mod

NH35 automatic with date

Seiko Sky-Dweller mods take the large-dial, fluted-bezel design onto the NH35 automatic with date, on a bracelet or a rubber strap.

SKY DWELLER WATCH MOD BLACK DIAL RUBBER STRAP
SKY DWELLER WATCH MOD BLACK DIAL RUBBER STRAP
Regular price $290.00 USDReference price: $330.00 USD
SKY DWELLER WATCH MOD GOLD-TONE CASE BLACK DIAL RUBBER STRAP
SKY DWELLER WATCH MOD GOLD-TONE CASE BLACK DIAL RUBBER STRAP
Regular price $290.00 USDReference price: $330.00 USD
SKY DWELLER WATCH MOD GREEN DIAL
SKY DWELLER WATCH MOD GREEN DIAL
Regular price $290.00 USDReference price: $330.00 USD

Seiko Speedmaster mod

VK63 chronograph

Seiko Speedmaster mods are tachymeter-bezel chronographs on the VK63 meca-quartz movement, with black or white dials.

MOONWATCH WATCH MOD BLACK ORANGE DIAL
MOONWATCH WATCH MOD BLACK ORANGE DIAL
Regular price $290.00 USDReference price: $330.00 USD
MOONWATCH WATCH MOD WHITE DIAL
MOONWATCH WATCH MOD WHITE DIAL
Regular price $290.00 USDReference price: $330.00 USD
SPEEDMASTER CHRONOGRAPH WATCH MOD SILVER BLACK DIAL
SPEEDMASTER CHRONOGRAPH WATCH MOD SILVER BLACK DIAL
Regular price $290.00 USDReference price: $330.00 USD

Seiko Explorer mod

NH34 automatic · 40 mm

Seiko Explorer mods are clean 40 mm sports watches with 3-6-9 numerals on the NH34 automatic, in black or white.

EXPLORER WATCH MOD BLACK DIAL
EXPLORER WATCH MOD BLACK DIAL
Regular price $290.00 USDReference price: $330.00 USD
EXPLORER WATCH MOD WHITE DIAL
EXPLORER WATCH MOD WHITE DIAL
Regular price $290.00 USDReference price: $330.00 USD

Questions

Halloween sale & Seiko mod FAQ.

When will my watch arrive?

4–6 business days to build, then 7–12 business days in transit.

Can I return my watch?

Yes. Sale orders follow our normal refund policy: as a consumer you can return it within 14 days without giving a reason. Unless the watch is faulty or we made a mistake, you cover the return shipping. Refund policy.

How is my watch built?

No. Every watch in the sale is hand-assembled after you order, checked before dispatch and shipped with its travel case, as on any other day.

Can I order a watch as a gift?

Yes. Enter the recipient's address at checkout. Each watch ships in secure packaging with its travel case. Gift wrapping and gift messages are not offered at the moment.

Who makes ModTime watches?

ModTime is an independent custom watch studio. We assemble every watch by hand after it is ordered, check it before dispatch and support it with a 12-month warranty.

ModTime is not affiliated with Seiko, Rolex, Audemars Piguet, Patek Philippe, Cartier or Omega. Their model names describe the design reference of a style, not the maker of the watch. Read more about our independence.

What is a Seiko mod?

A Seiko mod is a custom watch built around a Seiko-family movement, with a separately chosen case, dial, hands, bezel and bracelet. “Mod” describes the build: the finished watch is not made or sold by Seiko.

Are Seiko mods good watches?

A Seiko mod is as good as its parts and its assembly. Ours are built around movements from TMI, the movement maker of the Seiko group (NH34, NH35, NH38, VK63), or the Miyota 8285, with a sapphire crystal and a 904L steel case. Each watch is assembled by hand after you order and checked for function, alignment and finish before dispatch, with a 12-month ModTime warranty. ModTime watches are rated 4.9 out of 5 across 250+ reviews.

How much does a Seiko mod cost?

Every ModTime build costs $285–$365 in the US, with free US shipping and import costs included. Any applicable sales tax is shown at checkout.

How do I choose the right Seiko mod?

Start with what the watch should do: a date (NH35), a clean dial or open heart without a date (NH38), a second time zone (NH34 GMT), a stopwatch (VK63 chronograph) or the weekday and date (Miyota 8285). Then pick the style and size: Datejust, Oyster and Day-Date come in 36, 39 or 41 mm, Royal Oak and Aquanaut in 41 mm, GMT and Daytona in 40 mm and Santos in 38 mm.

Where can I buy Seiko mods online?

Right here on modtime.store. Every watch on this page is assembled by hand in our studio after you order, with free shipping to the US and the EU and a 12-month warranty.

Is the movement a genuine Seiko movement?

Our NH34, NH35, NH38 and VK63 calibres are made by TMI (Time Module), the movement maker of the Seiko group, and Day-Date builds use the Miyota 8285 automatic. Each product page names the movement in that exact watch. ModTime watches are independent builds, not official Seiko models.

Can I wear a Seiko mod every day?

Yes, that is what they are built for. Automatic builds wind themselves as you wear them, VK63 chronographs run on quartz, the sapphire crystal resists scratches and the 904L steel case resists corrosion. For water, 3 ATM handles rain and splashes and 5 ATM gives more margin; neither is meant for swimming or showering.

How do I set the time and size the bracelet?

Pull the crown out gently and turn it to set the time. On NH35, NH34 and NH38 builds the seconds hand stops while the crown is out, so you can set the time to the second. If an automatic has stopped after a few days off the wrist, wind it with the crown and set the time again, and never change settings underwater or while the watch is wet.

Metal bracelets arrive prepared for adjustment, with a complimentary adjustment kit. Remove a little at a time and test the fit before taking out more links. If you have never sized a bracelet, a local watchmaker is the safest option. More care questions.

Which movement is inside?

It depends on what the watch does: NH35 automatic with date, NH38 automatic without date (also in our open-heart builds), NH34 automatic GMT for a second time zone, VK63 meca-quartz chronograph, and Miyota 8285 automatic with day and date. Each product page names the movement in that watch. Our movement guide explains each one.

Which size should I choose?

Each product page lists the case size. Oyster, Datejust and Day-Date styles come in 36, 39 or 41 mm at the same price; other styles come in one size, for example 41 mm for Royal Oak and Aquanaut, 40 mm for Daytona and 38 mm for Santos.

Are the watches water resistant?

Every watch comes in 3 ATM as standard, with 5 ATM available as an option on the product page. 3 ATM is made for rain and splashes; 5 ATM gives more everyday margin. Neither is meant for swimming, bathing or diving. Water resistance, explained.

Do you ship Seiko mods to the US, and are there import fees?

Yes. Free US shipping and import costs included. Any applicable sales tax is shown at checkout. 4–6 business days to build, then 7–12 business days in transit. Shipping to EU countries is free as well. See the shipping policy.

How long does delivery take?

4–6 business days to build, then 7–12 business days in transit. Free US shipping and import costs included. Any applicable sales tax is shown at checkout. See the shipping policy for details.

Which payment methods can I use?

Shop Pay, PayPal, Apple Pay, Google Pay and major cards, all on Shopify’s encrypted checkout. Free US shipping and import costs included. Any applicable sales tax is shown at checkout.

What warranty do I get?

Every ModTime watch comes with a 12-month ModTime warranty. If something is not right, contact us and we will help. Warranty and support.

Can I choose a clean dial without a logo?

Where the product page offers it, choose LOGO or NO LOGO before adding the watch to your cart. You can also leave a note at checkout. Logo or no logo shows the difference.

Are there good automatic watches under $500?

Yes. Every ModTime watch costs under $400 in the US. Our automatic builds use the NH35 with date, NH34 GMT, NH38 open heart or Miyota 8285 day-date movement, depending on the model and variant. Our VK63 chronographs use a meca-quartz movement, not an automatic movement. Free US shipping and import costs are included; any applicable sales tax is shown at checkout.