“The Katana” 43.8mm 316L Stainless Steel Watch Case

The Katana is a bold 43.8 mm stainless-steel watch case designed for custom automatic watch builds and modifications.

Its angular, faceted case profile gives it the distinctive aggressive appearance associated with Samurai-style sports watches, complemented by a black bezel insert with contrasting white markings and a matching black chapter ring.

Manufactured from 316L stainless steel, The Katana accommodates a range of popular Seiko/TMI automatic movements, including the NH34 GMT, NH35, NH36 and NH38, making it a versatile foundation for anything from a conventional three-hand diver-inspired build to a GMT or open-heart project.

The case is designed for 28.5 mm dials and 22 mm straps or bracelets. A synthetic sapphire crystal provides improved scratch resistance compared with conventional mineral glass.

A substantial choice for builders looking for something with considerably more wrist presence than a conventional 39–40 mm mod case.