The Epson YM91 quartz chronograph watch movement is a gents’ 12 ligne multi-function chronograph featuring three central hands for hour, minute, and sweep seconds, along with two subdials and a date window at the 3 o’clock position. The 6 o’clock subdial displays small seconds, while the 12 o’clock subdial records up to 60 minutes. Measuring 24.00 mm × 27.60 mm with a thickness of 3.70 mm, this zero-jewel movement operates on a 395 battery and uses stem part number 351-584 with a 0.90 mm tap (tap 10). The hand sizes are 110/65/21/21 (hour/minute/seconds/indicators).
