Genuine Seiko Watch Movement 1F20 Quartz Movement 

• Outside Diameter: 4 1/4 x 5 1/4 Ligne or 10.0 x 12.5 mm
• Movement 2.20 mm thick
• The height from the bottom of the watch movement to the top of the minute pinion is 3.0 mm
• Requires watch cell: 337
• 2 handed movement
• Requires watch hands: hour .90, and minute .45 mm
• Hour wheel height .80mm
• Has NO jewels
• Stem: 351807, Tap 13
• Includes watch stem