Omega Constellation OMEGA Co-Axial Master Chronometer - 39 mm Yellow Gold Case - White Silvery Dial - Olive Leather Strap - 131.53.39.20.02.002 44.25 has a Titanium/Carbon 38 mm

has a Titanium/Carbon 38 mm Tonneau (Rectangle) Case with Screw Down Crown and a

champange dial

96 mm thick

has a Ceramic 42 mm Tonneau (Rectangle) Case with Screw Down Crown and a Ceramic

ardoise dial

Omega Constellation OMEGA Co-Axial Master Chronometer - 39 mm Yellow Gold Case - White Silvery Dial - Olive Leather Strap - 131.53.39.20.02.002 44.25 has a Titanium/Carbon 38 mm39 mm yellow gold case with anti magnetic protection, transparent back, bezel engraved with Roman numerals, domed scratch resistant sapphire crystal with anti reflective treatment on both sides, silk embossed white silvery dial with date at 6 oclock, Calibre Omega 8801 self winding co axial master chronometer movement with date, approximately 55 hours of power reserve, olive leather strap. Water resistant to 50 metres (167 feet).