Nautilus Seiko Mod

About

Pre-built Nautilus-inspired Seiko mod watches and individual parts for custom builds. Skeleton dials, brushed steel cases, rubber straps, and matching hands — all designed around the NH35/NH36 and NH72 movements with 28.5 mm dial compatibility. Every watch ships fully assembled and ready to wear; every part is tested for fit by our team in Oslo. Fits: NH35, NH36, NH38, NH70, NH71, NH72 movements Dial size: 28.5 mm (direct fit on all Nautilus cases) Case size: 39.5–40 mm · Thickness: 9.95–11.4 mm Watch out: Nautilus cases use a 3 o'clock crown — not compatible with 4 o'clock SKX-style stems How to Choose Your Nautilus Mod Pre-built watch vs. custom build: Our pre-built Nautilus watches ship fully assembled with movement, dial, hands, and strap — ready to wear out of the box. If you want to choose your own dial color, hands, or strap, browse the individual parts below and build from scratch using our complete build guide . Movement choice: The NH35/NH36 gives you a solid, reliable automatic movement with a date complication. The NH72 is the skeleton variant — choose this if you want visible mechanics through an open-worked dial. All Nautilus cases accept both. Case finish: Available in silver (brushed steel), gold (PVD), rose gold (PVD), and black (DLC). The brushed-to-polished transition on the bezel is consistent across finishes. Silver is the most versatile; gold and rose gold make a stronger statement. Strap vs. bracelet: Nautilus watches come with rubber straps (gray, green, or black depending on model). The integrated lug design means standard straps don't fit — use Nautilus-specific straps with 20 mm lug width. Frequently Asked Questions What movements are compatible with Nautilus cases? All Nautilus cases accept NH35, NH36, NH38, NH70, NH71, and NH72 movements. The skeleton builds use the NH72 for visible mechanics through the dial. All cases use a 3 o'clock crown position — they are NOT compatible with 4 o'clock SKX-style stems or 7S26/7S36 movements. What si