1F21 Seiko Quartz Watch Movement is a 3 hand movement (hour/minute). This ladies movement is a 4 1/2 x 5 1/2 ligne movement, dimensions are 10.00mm x 12.50mm with a thickness of 2.80mm, overall movement height is 2.93mm. Hand dimensions are 90/45/20 (h/m/s). 0 jewel movement, uses 337 battery. Stem is supplied with the movement. Stem is a part number 351-807, this stem is a tap 0.60mm (tap 13).