Omega Speedmaster Moonphase Master Chronometer Chronograph Watch - 44.25 mm Steel Case - Sedna Gold Bezel - Brown Diamond Dial - Brown Leather Strap - 304.23.44.52.13.001 Green blue dial with Roman numerals

blue dial with Roman numerals and index hour markers

42 mm 18K yellow gold case

black calfskin strap by santoni

all models in the range are designed with open water activities in mind

Omega Speedmaster Moonphase Master Chronometer Chronograph Watch - 44.25 mm Steel Case - Sedna Gold Bezel - Brown Diamond Dial - Brown Leather Strap - 304.23.44.52.13.001 Green blue dial with Roman numerals44. 25 mm stainless steel case with anti magnetic properties, transparent back, 18K Sedna gold crown and push pieces, 18K Sedna gold bezel with brown ceramic ring and Ceragold tachymeter scale, scratch resistant sapphire crystal with anti reflective treatment on both sides, brown sun brushed dial with diamond polished 18K Sedna gold indexes and hands, caliber 9904 self winding Co Axial master chronometer movement with chronograph and moonphase