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We carry the most complete selection of mod parts available anywhere ā not all of them are listed online. Feel free to contact us with your custom request via the Instagram or email links at the bottom of the page. We'll help you check availability and feasibility, including dial and caseback printing, bezel and dial swaps, and more.
USAMODWATCH is an independent brand that hand-assembles every watch in the U.S. We use genuine Seiko movements and high-quality components to build Seiko mods that are both reliable and truly one-of-a-kind. Each piece is carefully crafted to combine Seiko's trusted performance with a unique design you won't find anywhere else.
Automatic watches run on a spring-driven movement powered by your wrist's motion. If not worn, they will stop after 41 hours, but just by wearing it again during your daily activities, it will automatically resume running. Quartz watches are battery-powered and highly accurate. They offer convenience and precision, requiring minimal maintenance.
Each Seiko movement has a slightly different function and structure: NH35 ā the most common and reliable automatic movement, with date display. NH36 ā similar to NH35 but adds a day-date function. NH38 / NH39 ā no date, cleaner dial design, often used for minimal or open-heart styles. NH70 ā a skeletonized version, showing the internal mechanics in motion. All are automatic, self-winding, and built with Seiko's precision ā the main differences lie in display functions and visual design.
No. Most of our watches are rated 5 ATM for everyday water resistance. However, we don't recommend wearing it while showering or swimming. The conditions in those environments, such as water vapor, differ from accidental water exposure, and may affect the watch. Water damage is not covered under warranty.
Before shipping: You can request a full refund within 48 hours. After shipping: Returns are accepted if the watch remains in original, resaleable condition. DIY custom watches are non-refundable, unless there are significant quality issues.
All our watches include lifetime free repair service. You only cover shipping and parts; we handle the craftsmanship. Simply contact us and send your watch in ā our team will restore it with care.

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