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NAUTILUS WATCH MOD SILVER BLACK OPEN HEART DIAL

$330.00 USD
$290.00 USD
$290.00 USD
SALE SOLD OUT
Final price · Free US shipping
4.9 250+ ModTime Reviews
DIAL
WATER RESISTANCE
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  1. Parts in stockToday
  2. Hand-Assembled4–6 working days
  3. DeliveredAfter dispatch
After dispatch

Key Features & Benefits

  • Movement: NH38
  • Crystal: Sapphire
  • Case: 904L stainless steel case

What's Included?

Custom ModTime Watch
Your watch is assembled to order from compatible components selected for the chosen case, dial, movement and bracelet or strap configuration.
Adjustable Bracelet or Strap
Bracelet or strap fit depends on the selected product configuration. Bracelet sizing support is included when applicable.
Protective Watch Box
Each order is packed in protective packaging for safe delivery and storage.
Support After Purchase
ModTime support can help with setup questions, bracelet adjustment and order-specific details after delivery.

Why ModTime?

Independent Custom Workshop
Each ModTime watch is assembled as an independent custom build from compatible components. ModTime is not affiliated with, endorsed by, or an official service provider for any OEM or luxury watch brand.
Specs Before Claims
Movement, case size, bracelet or strap, water-resistance option and dial details are stated on each product page so the buyer can judge the build clearly.
Quality-Controlled Before Dispatch
Each watch is visually checked and function-tested before dispatch.
Direct Support
If a buyer needs help choosing a model or understanding an option, ModTime support can clarify the order before or after purchase.

Shipping Info

Free tracked shipping to the US. Import costs are included; there are no import surcharges on delivery. See checkout for the final order total.

Each watch is hand-assembled within 4-6 days to ensure the highest quality and attention to detail.
Once completed, the shipping time is 7-12 days, depending on your location. While we aim for prompt delivery, some variations may occur based on the destination.
Please note: Due to the current global shipping conditions, especially related to parcel traffic in and out of the US, delivery times may occasionally be slightly extended. However, we do everything on our side to ensure the fastest possible handling and dispatch.

Warranty

Every ModTime timepiece is protected by a complimentary 12-month warranty, giving you complete confidence in the craftsmanship, assembly, and performance of your watch.
Our warranty covers all manufacturing and movement-related defects that may occur during normal, intended use — including issues with the movement, hands, alignment, or other internal components.
Every ModTime watch is individually hand-assembled and tested, but if you ever experience an issue, our support team will provide fast, personalized assistance and a seamless service experience.
Please note that the warranty does not cover:
• accidental damage or impacts
• water exposure beyond the rated limits
• misuse, improper handling, or unauthorized modifications

ModTime In Motion

 View full details

On their wrist. In their words.

Technical Specifications

DIAMETER41 mm
MOVEMENTNH38
THICKNESS12 mm
GLASSSapphire
CASE904L stainless steel case
WATER RESISTANCE3 ATM

More from the Nautilus collection.

Explore the collection

Your style. Your custom watch.

We start with a Japanese movement.

Match the dial, case and bracelet to your style.

Then assemble your custom watch, piece by piece.
Watch assembly: exposed movement and white date wheel in a silver-tone holder, close-up beside tools

HAND-CRAFTED

Every watch we create is hand-assembled from start to finish, ensuring a level of quality, attention to detail, and character that mass-produced timepieces simply cannot match.

Our watches are crafted piece by piece — from the case and dial to the hands, crystal, and movement regulation. Each component is carefully selected and manually integrated by experienced watchmakers who control the process at every step. The result is a timepiece that feels personal, refined, and built with intention.

QUALITY-CHECKED PARTS

At ModTime, every timepiece is built using carefully selected, premium-grade components that meet the highest standards of durability, precision, and modern watchmaking.

Our watches are hand-assembled from individual components, allowing our watchmakers to inspect, adjust, and refine each element with absolute precision. This meticulous process ensures that every ModTime watch feels solid, refined, and engineered with intention.

NH34A automatic movement, marked rotor and balance wheel through a clear caseback, animated close-up

Japanese Movements

We exclusively use Japanese Movements, known globally for their accuracy, consistency, and low-maintenance design. Depending on the model, our timepieces feature:

  • Automatic movements such as NH34, NH35, and NH38, offering smooth operation, excellent power reserve, and trusted mechanical reliability.
  • Meca-Quartz chronograph movement VK63, combining mechanical chronograph feel with quartz precision for superior everyday performance.
Soft brush cleaning the crystal of a green-dial Datejust-style watch held in a gloved hand

SAPPHIRE CRYSTAL

Our watches feature scratch-resistant sapphire crystal, trusted in fine watchmaking for its durability and clarity. It protects the dial from everyday wear while preserving a clean, refined look.

  • Highly resistant to scratches
  • Excellent transparency for clear dial visibility
  • Built for reliable, everyday use

Engineered for durability. Refined for daily wear.

Gloved hands holding a two-tone silver and rose-tone watch bracelet, animated close-up of the links

STAINLESS STEEL

Our watches are crafted from 904L stainless steel, a premium-grade alloy known for its exceptional strength, corrosion resistance, and refined finish.

  • Highly resistant to corrosion and wear
  • Smooth, polished surfaces with lasting shine
  • Chosen for durability, comfort, and a premium feel

Built to endure. Finished to impress.

Open beige zippered watch travel case with three cushioned slots and watches, held in hand

Luxury unboxed

ELEVATE YOUR EXPERIENCE

At ModTime, we believe a watch should be more than just an accessory — it should be an experience.

Every ModTime creation arrives in a handcrafted case, a reflection of our dedication to quality, precision, and timeless design.

Each order also includes a complimentary adjustment toolkit and a step-by-step guide, allowing you to tailor your bracelet for the perfect fit.

From the first moment of unboxing to the years of wear ahead, your ModTime watch is crafted to deliver lasting satisfaction and refined elegance.

EXPLORE NOW

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Need Help?

Frequently Asked Questions

What is a custom ModTime watch?

A ModTime custom watch is an independently assembled watch built from compatible components around a chosen movement, case, dial and bracelet.

The term "MOD" comes from "modification". These modifications are generally made for those who wish to personalize their watch according to their specific tastes or needs. Modifications can vary considerably, from minor aesthetic changes to more complex technical revisions.

ModTime custom watches are independently assembled around compatible components and selected specifications. ModTime is not affiliated with, endorsed by, or an official service provider for any OEM or luxury watch brand.

Which movements do we use?

At ModTime, we work exclusively with reliable, high-grade Seiko movements — trusted by watch enthusiasts worldwide for their precision and durability.

Each movement is carefully selected and tested by our watchmaker to ensure optimal performance and a smooth mechanical experience.

We use:

  • NH34 Automatic — for our GMT Mods
  • NH35 Automatic — for date dial builds
  • NH38 Automatic — for clean dial designs without a date
  • VK63 Mecha-Quartz — for chronograph models


Every ModTime watch is powered by a movement chosen for its accuracy, longevity, and craftsmanship — the foundation of every timepiece we create.

Can I adjust the watch size myself?

Absolutely! Every ModTime timepiece comes with a complimentary adjustment kit, allowing you to resize your bracelet easily and safely at home.

Each tool is designed for precision and comfort — the same way our watches are crafted.

If you prefer, your local watchmaker can also assist you with the adjustment — our bracelets use standard Seiko-compatible links, making professional resizing simple and effortless.

Can I choose a clean or dial-marked version?

Use the LOGO / NO LOGO selector on this product page before adding your watch to the cart. Check the selected option in your cart before checkout.

Can I design my own watch?

Can I design my own watch?

Absolutely. At ModTime, every timepiece can be crafted to your personal vision — from the bracelet and case to the dial, hands, and finishing details.

You can even add your own logo or initials, turning your watch into a truly one-of-a-kind creation.

If you’d like to design a fully personalized ModTime piece, simply reach out to us on WhatsApp. Our watchmakers will guide you through every step of the customization process — from concept to final assembly.

Shipping Times and Costs

Free tracked shipping to the US. Import costs are included; there are no import surcharges on delivery. See checkout for the final order total.

Each custom watch is hand-assembled to order. Typical assembly time is 4-6 business days.

After dispatch, delivery usually takes 7-12 days depending on destination, carrier flow and customs handling.

You will receive order support from ModTime if anything needs clarification before or after dispatch.

Are the watches water resistant?

ModTime watches use variant-dependent water-resistance options such as 3 ATM or 5 ATM. 3 ATM is intended for daily splashes and rain. 5 ATM gives more everyday margin, but custom watches should still be kept away from swimming, bathing, diving and prolonged water exposure unless a specific model is explicitly rated for that use.

No answer matches that yet. Try a broader word — or reach our watchmakers on WhatsApp and we’ll help directly.

BUILD STORY

Materials and function of this build

NH38 no-date automatic. Wrist movement winds the mechanical movement. This no-date configuration keeps the time display free of a date window. Where this version has an open-heart or skeleton dial, that opening is a view of the mechanics rather than an additional timing function.

Choose this function when an uninterrupted dial or a view of mechanical movement is your priority.

This version: NAUTILUS WATCH MOD SILVER BLACK OPEN HEART DIAL. Compare this version’s dial and finish in the product photographs, then select the configuration on this page.

904L stainless-steel case: a corrosion-resistant case material. This specification refers to the case, not automatically to every bracelet or clasp component. The finish colour is a separate feature, and steel can still show wear.

Sapphire crystal: highly resistant to surface scratches, helping keep the dial readable. Sapphire can still chip or crack under impact; the material name alone does not imply an anti-reflective coating.

Explore the 904L case material, sapphire crystal and NH38 no-date automatic function guide before choosing your build.

A silver black open-dial sport watch turns contrast into a slower visual experience.

The opening adds interest, but the black dial still needs to stay calm. If the details compete, the watch loses the clean read that makes the color pairing useful.

The silver frame gives the design light, the black center gives it focus, and the open-dial detail adds a second moment for the eye.

This build works because the detail arrives after the structure, not before it.

It is for someone who wants a custom watch with contrast, sport shape and a more considered dial composition.