Omega Speedmaster '57 Omega Co-Axial Chronograph Watch - 41.5 mm Steel Case - Brushed Bezel - Silver Dial - Brown Leather Strap - 331.12.42.51.02.002 Sandy caliber 2500 self-winding movement with

caliber 2500 self-winding movement with co-axial escapement movement

Caliber Omega 8902 self winding movement with co-axial escapement

Calibre Omega 8922 self-winding co-axial master chronometer movement with date and annual calendar

two-tone black and blue counters

5 mm sedna gold case with anti-magnetic properties and helium escape valve

Omega Speedmaster '57 Omega Co-Axial Chronograph Watch - 41.5 mm Steel Case - Brushed Bezel - Silver Dial - Brown Leather Strap - 331.12.42.51.02.002 Sandy caliber 2500 self-winding movement with41. 5 mm stainless steel case, transparent back, brushed bezel with with tachymeter scale, scratch resistant sapphire crystal with anti reflective treatment on both sides, silver dial, self winding chronometer Omega 9300 movement with Co Axial Escapement, chronograph, date, and small seconds, approximately 60 hours of power reserve, brown leather strap. Water resistant to 100 m.