Omega Speedmaster Moonphase Master Chronometer Chronograph Watch - 44.25 mm Yellow Gold Case - Silvery Diamond Dial - Black Leather Strap - 304.63.44.52.02.001 XVII CROWN Screw Locked BEZEL Ceramic

CROWN Screw Locked BEZEL Ceramic MOVEMENT Automatic DIAL COLOR Black DIAL TYPE Analog DIAL MARKERS Openworked BAND MATERIAL Rubber CLASP AP Folding Clasp WATER RESISTANCE 100 Meters (330 Feet) GENDER Men's

Caliber Omega 8807 self-winding movement with a co-axial escapement

CALIBER 5135 MOVEMENT Automatic HANDS Luminous DIAL TYPE Analog DIAL MARKERS Grande Tapisserie CLASP AP Folding Clasp WATER RESISTANCE 20 Meters (60 Feet) GENDER Men's

While its internal surface is shaped like a dome

Omega Speedmaster Moonphase Master Chronometer Chronograph Watch - 44.25 mm Yellow Gold Case - Silvery Diamond Dial - Black Leather Strap - 304.63.44.52.02.001 XVII CROWN Screw Locked BEZEL Ceramic44. 25 mm 18K yellow gold case with anti magnetic properties, transparent back, 18K yellow gold bezel with black ceramic ring and Ceragold tachymeter scale, scratch resistant sapphire crystal with anti reflective treatment on both sides, opaline silvery dial with diamond polished 18K yellow gold indexes and hands, caliber 9905 self winding Co Axial master chronometer movement with chronograph and moonphase indication, approximately 60 hours of power