The Seiko 2P21-5D10 is a watch model based on the 2P21 movement.
Parts List
| K00W78JN01 | crystal |
| 30MA2NA1 | crown - crown |
| 0A1600N01 | case back gasket |
| RS05A | band - metal band |
| RS06A | band - metal band |
| 07SC02NG | others - second hand |
| 0351236 | others - winding stem |
| 05T02NGM | others - minute hand |
| 2P210J00XG14 | others - dial |
| 2P210J10XS14 | others - dial |
| 2P215D10 | others - case back |
| 2P215D1075 | others - case |
| 2P219 | others - machine code |
| 82811560 | others - case ring |
| B080AS | others - push pin |
| EZ0035B01 | others - crown and stem gasket |
| 05T06NGH | others - hour hand |
| 05T18DAH | others - hour hand |
Caliber 2P21
