The Seiko 2P21-0270 is a watch model based on the 2P21 movement.
Parts List
| 180W51JM01 | crystal |
| 30M57NA1 | crown - crown |
| 0F145BAA7 | case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| TB01A | band - metal band |
| 3BA075F1BNG | others - second hand |
| 1BC047A1BNG | others - hour hand |
| 2BC070A1BNG | others - minute hand |
| 07SC43NG | others - second hand |
| 0351236 | others - winding stem |
| 81181459 | others - bracelet fixing pipe |
| 81604259 | others - bracelet fixing pin |
| 81604039 | others - bracelet fixing pin |
| 2P210270 | others - case back |
| 2P210270SA | others - case |
| 2P210890XS19 | others - dial |
| 2P219 | others - machine code |
| 82802430 | others - case ring |
| 07T27NGH | others - hour hand |
| 07T27NGM | others - minute hand |
Caliber 2P21
