Formex Reef GMT Green Features: Movement: Swiss Made Sellita SW330-2 (self-winding) Automatic (Chronometer grade), officially certified by COSC. 25 jewels. Custom-built skeleton rotor with thermally blued screws. 24 hour GMT hand with quick set GMT functionality allows for three time zones Date display 56 hour power reserve Case diameter: 42mm Height: 11.4mm (perceived 9.4mm) Lug width: 22mm Lug-to-lug: 47mm Water resistance: 300m Weight: 90g (case only) Bezel: Bi-directional and exchangeable rotating Zirconium Oxide Ceramic/Stainless Steel bezel (48 click) Case: Stainless steel 316L Sapphire crystal with anti-reflection treatment Exhibition case back Strap options: Black rubber strap with curved spring bars, Quick Release function and carbon fiber composite deployant clasp with patented Micro-Adjustment System. Stainless steel bracelet with screwed links, Quick Release function and stainless steel buckle with patented Micro-Adjustment System BGW9 Super-LumiNova on hands and indexes