Omega Speedmaster Moonwatch Chronograph Caliber 321 (3220.127.116.11.01.001). Caliber 321 manual winding chronograph movement with 55 hours power reserve. 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 markers. Ceramic bezel stamp a Tachymeter scale and set on a 39.7mm stainless steel case. Sapphire crystal on top and exhibition case back. Water resistant to 50m. Stainless steel bracelet.