Black Seiko Nautilus Mod (Open Heart)

A Seiko mod refers to the customization or modification of a Seiko watch, where enthusiasts change parts like dials, hands, bezels, or straps to create a unique look or improve functionality. This modification process allows our customers to tailor their watch to better reflect their personal style, preferences, or specific functional needs. Hand assembled by highly qualified watch builders, we utilize a wide range of authentic to high quality aftermarket parts to bring your dream watch to life.

1. Assembly: Takes 3-5 working days to handcraft your custom timepiece.

2. Quality Testing: After assembly, we dedicate an additional 1–3 days to testing and quality assurance to guarantee top performance.

3. Shipping: Once perfected, your watch is dispatched, with delivery typically taking 5–9 business days depending on location.

Altogether, the journey from creation to delivery generally takes 8–16 business days (Monday–Friday) — a process designed to uphold the highest standards of craftsmanship before your watch reaches your hands.

As for shipping, it’s completely free — and we’ve also covered your country’s import duties in the price. That means you won’t face any extra fees or hidden charges upon delivery.

Please note: Delivery times may vary depending on the destination country.

Our watches adjustable bracelet size fit any sizes between 14.5cm - 22cm. Each watch comes with a free complimentary watch tool, provided to you to ensure the perfect fit with ease.

Every watch comes with a free one year warranty. This warranty covers any manufacturing defects and operating problems under normal use.

We are not responsible for any damages made to the watch after recieving it.

Yes! You can create your very own dream watch using our Seikojust Configurator, which offers a wide range of customizations — from dial styles and case finishes to hands, bezels, and more.