A Seiko Mod is a custom-built watch made using Japanese movements manufactured by TMI (Time Module Inc.), a subsidiary of the Seiko Group, such as NH34, NH35, NH72, and VK63.

These movements are paired with high-quality aftermarket cases and dials, then independently assembled to create a unique timepiece. A Seiko Mod is not an official Seiko-branded product.

Disclaimer: Watchbrick is an independent brand and has no affiliation with any other manufacturer.

Yes! You can build your own Seiko mod using our online customization tool. Select every detail and we’ll hand-assemble it for you.

We operate two workshops, located in Hong Kong and GC. Our Hong Kong workshop handles the assembly and global fulfilment of most orders, while the GC location is primarily used for component storage and inventory support. Most orders are assembled and shipped from Hong Kong. FREE worldwide shipping is available on all orders.

Made to order – requires 5–7 business days before shipping. Free Shipping By DHL 6–14 days. No duties.

More Information about Shipping Policy.

10–14 business days via Royal Mail or local post. No duties or VAT.

More Information about Shipping Policy.

Due to recent changes in U.S. import regulations, all orders shipped via DHL to the United States may incur an import duty payable by the customer. Once your order is dispatched, DHL will contact you directly (via SMS or email) with a payment link. Please ensure the duty is paid within 5 days to avoid your parcel being returned to Hong Kong. If unpaid, the package will be automatically returned, and any re-shipping costs may be your responsibility. We’re unable to mark packages as gifts or under-declare values due to customs compliance.

More Information about Shipping Policy.