The Seiko 2P21-5150 is a watch model based on the 2P21 movement.
Parts List
| SAFN89JN01 | crystal |
| 30N63NA1 | crown - crown |
| 0G1650B01 | case back gasket - case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
Caliber 2P21
Seiko 2P21-5150 Watch Guide