MODEL : Explorer IIMODEL NUMBER : 226570-0001MODEL CASE : Oyster, 42 mm, OystersteelOYSTER ARCHITECTURE : Monobloc middle case, screw-down case back and winding crownDIAMETER : 42 mmMATERIAL : OystersteelBEZEL : Fixed, 24-hour graduatedWINDING CROWN : Screw-down, Twinlock double waterproofness syste..