Omega Speedmaster Moonwatch Co-Axial Master Chronometer Chronograph (310.30.42.50.01.001)
Omega 3861 Manual Manual Winding chronograph movement with central chronograph hand. Small 30 minute counter at 3 o'clock position, 12 hour counter at 6 o'clock position, 60 seconds counter at 9 o'clock position. Black dial with index hour counters. Steel bezel stamped with a Tachymeter scale and set on a 42mm stainless steel case. Hesalite crystal on top and solid caseback. Water resistant to 50M. Stainless steel with steel folding clasp.