Jules Audemars 23685 Moon Phase CalenderModel : Polished Stainless Steel Case, Metallic Black Dial, Stick Markers on Leather Strap with Insignia Buckle Movement: Miyota 9100 Automatic Movement With Calendar Complications, 24J, Rose Gold Rotor Functions: Hours, Minutes, Day, Month, Sun Moon Day Phase Month (Set Via 2.00 Pusher) Note : Day will advance Automatically with Time, Month eeds Manual Adjustment Dimensions : Dia 41mm x 12mm Thk Material : 1 piece forged case construction, solid 316 stainless steel Back : Display Caseback with Detail Engraving Crown : One-piece Pull Out crown with o ring Crystal: Sapphire Crystal Water-resistant