YL50 Epson Quartz Watch Movement YL50 Epson Quartz Watch Movement is a 2 hand movement (hour/minute). This ladies movement is a 4 1/4 ligne movement, dimensions are 9.50 mm with a thickness of 2.78 mm, overall movement height is 3.51 mm. Hand dimensions are 90/45 (h/m). 5 jewel movement, uses 335 battery. Stem is a tap 0.60 mm (tap 13), stem part number is 351-931.