The Black Bay One models bring a unique aesthetic to the Black Bay line. Their curved cases offer a language that slightly departs from the brand’s iconic tool watch spirit to embrace a sophisticated, versatile, unisex chic. Ref. No m79660-0003 Description Tudor Black Bay One 39 Manufacture Calibre MT5602 39mm Case 39mm stainless steel case with polished and satin finish Lugs: 21mm lug width Case thickness: 12.0mm Winding Crown Screw-down crown with the TUDOR rose in relief Movement: Manufacture Calibre MT5602 (COSC) Self-winding mechanical movement with bidirectional rotor system Bezel: Stainless steel bezel with polished and satin finish Crystal: Flat sapphire crystal Waterproofness: Waterproof to 100m (330 ft) Guarantee: Five-year transferable guarantee with no registration or periodic maintenance checks required Bracelet Stainless steel bracelet, polished and satin finish, with TUDOR “T-fit” folding clasp and safety catch Size Guide