Y121ER Epson Quartz Watch Movement Y121ER 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 4.85 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. This is the same movement as the Y121E, with the exception that the plates are yellow.

Movement Interchange
Hattori, Pulsar VP01 hands are different, V501, V515