1F21 20 Seiko Quartz Watch Movement a 3 hand movement (hour/minute/sweep seconds). This ladies movement is a 4 1/2 x 5 1/2 ligne movement, dimensions are 10.00 mm x 12.50 mm with a thickness of 2.40 mm, overall movement height is 3.47 mm.

Hand dimensions are 90/45/20 (h/m/s). 2 jewel movement, uses 337 battery. Stem is supplied with the movement. Stem is a part number 351-807, this stem is a tap 0.60 mm (tap 13).