The Supermarine S302 is a mission-ready mechanical timepiece with GMT function, 50-hour power reserve and 300m water resistance. Blue integrated rubber strap with pin buckle clasp. Standard length strap, fits 16.5cm to 22cm wrists. Encased in a compact 40mm stainless steel Bremont Trip-Tick® case with a domed anti-reflective, scratch resistant sapphire crystal and 24 hour uni-directional rotating bezel. Powered by a modified calibre BE-932AV automatic movement, chronometer rated to ISO 3159 standard.