Omega Speedmaster '57 Omega Co-Axial Chronograph Watch - 41.5 mm Steel Case - Brushed Bezel - Blue Dial - Brown Leather Strap - 331.12.42.51.03.001 Gents blue dial and the inner

blue dial and the inner ring are sun-brushed 18K Sedna gold treated with blue PVD

caliber 9300 self-winding movement with chronograph function

caliber 9621 MC self-winding mechanical movement

caliber 8520 self-winding movement with chronometer and automatic winding in both directions to reduce winding time

white mother-of-pearl dial with diamond hour markers and scratch-resistant saphire crystal

Omega Speedmaster '57 Omega Co-Axial Chronograph Watch - 41.5 mm Steel Case - Brushed Bezel - Blue Dial - Brown Leather Strap - 331.12.42.51.03.001 Gents blue dial and the inner41. 5 mm stainless steel case, transparent back, brushed bezel with with tachymeter scale, scratch resistant sapphire crystal with anti reflective treatment on both sides, blue 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.