Seiko Mod Cases — Royal Oak, Nautilus, Aquanaut, Petrichor

Build your Seiko mod around a case that defines the look and the fit. From angular Royal Oak and elegant Nautilus to sporty Aquanaut and minimalist Petrichor, our cases are engineered for NH35/NH36 compatibility with clear fit notes for crystals, crowns, bezels, and bracelets.

FAQ

The 37mm cases suit wrists under 7 inches with a vintage, refined look. The 41mm cases offer more wrist presence for larger wrists. Both sizes accept NH35, NH36, NH70, NH71, and NH72 movements.

Nomods cases are designed for NH35, NH36, NH38, NH70, NH71, and NH72 movements. Each product listing specifies compatible movements.

Royal Oak 37mm and Petrichor cases use 28.5mm dials. Royal Oak 41mm and Nautilus cases use 30.8mm dials. Always match dial diameter to case specifications before ordering.