The Seiko 2P21-0A90 is a watch model based on the 2P21 movement.
Parts List
| 190W14SN02 | crystal - crystal |
| 30MA2NA1 | crown - crown |
| 30MA2NS1 | crown - crown |
| 0A1800N01 | case back gasket |
| 86570340 | crystal gasket |
| MK20D | band - band |
| DK36C | band - leather band |
| DK40C | band - leather band |
| DK41C | band - leather band |
| DK54D | band - leather band |
| 07SC02NG | others - second hand |
| 08SC14NG | others - second hand |
| 07TA4FGM | others - minute hand |
| 0351236 | others - winding stem |
| 2P210A9075 | others - case |
| 82801760 | others - case ring |
| 2P210A90 | others - case back |
| 2P210A907E | others - case |
| 2P210E90XG19 | others - dial |
| 2P210E90XS19 | others - dial |
| 2P210F00XS19 | others - dial |
| 2P210K10XS13 | others - dial |
| 2P210K70XS19 | others - dial |
| 2P219 | others - machine code |
| A120AS | others - push pin |
| 08SC14NS | others - second hand |
| EZ0035B01 | others - crown and stem gasket |
| 07TC0FGH | others - hour hand |
| 08T24AGH | others - hour hand |
| 08T24AGM | others - minute hand |
| 08T02ASH | others - hour hand |
| 08T02ASM | others - minute hand |
| 08TD4FGH | others - hour hand |
| 08TA0A1M | others - minute hand |
Caliber 2P21
