The Seiko 2P21-523A is a watch model based on the 2P21 movement.
Parts List
| SA5W09SN01 | crystal - crystal |
| 32M09NA1 | crown - crown |
| 0F170BAA3 | case back gasket - case back gasket |
| DL09B | band - band |
| 3BA075F1BNG | others - second hand |
| EB0055B01 | others - crown and stem gasket |
| 82820230 | others - case ring |
| 2P21523A6M | others - case |
| 2P21523A | others - case back |
| 2P210710XG24 | others - dial |
| 2P219 | others - machine code |
| A120AS | others - push pin |
| 07T07DGH | others - hour hand |
| 07T07DGM | others - minute hand |
| 1BA047A1BNG | others - hour hand |
| 2BA070A1BDG | others - minute hand |
| 2BA070A1BNG | others - minute hand |
Caliber 2P21
