Omega Speedmaster `57 331.

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Omega Speedmaster (331. Caliber 9300 Automatic Co-Axial chronograph movement with central chronograph hand. Date window at 6 o`clock position, small 30 minute counter at 3 o`clock position and 60 seconds counter at 9 o`clock position. White dial with index hour makers. Titanium bezel stamped with Tachymeter scale and set on a 44.25 mm Titanium case. Sapphire crystal on top and exhibition case back. Water resistant to 100M. Leather strap with titanium folding clasp.