BRAND:Rolex MODEL:GMT-Master IIMODEL NUMBER:116713LNMATERIAL:Yellow Rolesor - combination of Oystersteel and 18 ct yellow goldBEZEL:Bidirectional rotatable 24-hour graduated bezelWINDING CROWN:Screw-down, Triplock triple waterproofness systemCRYSTAL:Scratch-resistant sapphireWATER-RESISTANCE:Waterproof to 100 metres / 330 feetCALIBRE:3186, Manufacture Rolex