Y121G Epson Quartz Watch Movement Y121G Epson Quartz Watch Movement is a 3 hand movement (hour/minute/sweep seconds). This ladies movement is a 6 3/4 x 8 ligne movement, dimensions are 15.30 mm x 17.80 mm with a thickness of 2.99 mm, overall movement height is 4.42 mm. Height over dial seat is 1.43 mm. Hand dimensions are 110/65/20 (h/m/s). 0 jewel movement, uses 377 battery. Stems are available in a multiple of stem thread (tap) diameters. Tap 0.90 mm (10) use stem number 354-788, Tap 0.80 mm (11) use stem number 354-786. Movement is engraved with the number 1. You will see the number 4 in a hexagon symbol, this #4 indicates that this movement has a battery life of 4 years, where the standard Y121E only has a battery life of 2 years.