Seiko 7T12

Seiko caliber 7T12 is a Japanese-made quartz chronograph movement with zero jewels. It maintains accuracy within +/- 15 seconds per month and uses an SR927W battery delivering approximately five years of operation. A low battery indicator triggers the small second hand to jump every two seconds while maintaining timekeeping accuracy. The movement, also known as YM12, appears in Seiko chronograph watches and features sweep seconds with a 60-minute chronograph counter.