gorilla 39Diameter: 39.00 mm; Thickness: 11.00 mm; With crown guards: 43.10 mm; Lug to lug: 50 mm; Water resistance: 100M330FT10ATM; Scratch resistant sapphire, double anti-reflectiveThe Silver back Gorilla is a Mountain GORILLA: These great apes have black to grayish or reddish