Model : Polished SS Case, Smooth Bezel, Black 2 Tone Dial, Numeral Markers, On Leather Strap with Insignia Single Fold Deployant Buckle Movement: Asian 2813 Automatic movement, 21J, Decorated Rotor Functions: Hours, Minutes, Secs, Day, Month, 24 Hour, Sun-Moon Phase Day, 24 Hoursand Sun Moon Phase will advance automatically with time.. Month Need Manual Setting .. Setting of Day and Month via Recess Pushers at Case Sides Dimensions : Diamter 43mm x 13mm Thk Material : 1 piece forged case construction, solid 316 stainless steel plating Back : Display Caseback with Detail Engraving Crown : One-piece solid pullout crown with o ring Crystal: - Synthetic Sapphire Water-resistant