Model : SS Case, Black Dial, White Roman Numeral Markers on Leather strap with Insignia Deployant Clasp Movement: Asia Automatic Movement with Calender Functions. 21J Functions: Hours, Minutes, Seconds Date (12.00 Window), Day ( 10.00 Window) Month (2.00 Window) Sun-Moon Phase All Calender features will advance automatically with time.. Only Month needs manual adjustment via recess pushers Dimensions : Diameter 42mm x 13mm Thk Material : 1 piece forged case construction, solid 316 stainless steel Back :Officier Caseback over Display case back rown : One-piece pull out crown with o ring Crystal: Sapphire Crystal Water-resistant