The Seiko 2P21-5B20 is a watch model based on the 2P21 movement.
Parts List
| REAN10JN01 | crystal |
| 30M98NA1 | crown |
| 0H1720N01 | case back gasket - case back gasket |
| DZ0041B01 | others - crown and stem gasket |
Caliber 2P21
Seiko 2P21-5B20 Watch Guide
The Seiko 2P21-5B20 is a watch model based on the 2P21 movement.
| REAN10JN01 | crystal |
| 30M98NA1 | crown |
| 0H1720N01 | case back gasket - case back gasket |
| DZ0041B01 | others - crown and stem gasket |