The Seiko 2P21-5220 is a watch model based on the 2P21 movement.
Parts List
| ESCW35SN01 | crystal - crystal |
| 30M57NA1 | crown - crown |
| 30M57NS1 | crown - crown |
| 0F165BAA5 | case back gasket - case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| DL02B | band - leather band |
| DL07B | band - leather band |
| DL01B | band - band |
| 3BA075F1BNG | others - second hand |
| 3BA075F1BNS | others - second hand |
| 2BA065A1BNG | others - minute hand |
| 1BC045A1BAA | others - hour hand |
| 07SC25NG | others - second hand |
| 06T05NGM | others - minute hand |
| 1BA045A1BNG | others - hour hand |
| 06T11NGH | others - hour hand |
| A130AS | others - push pin (for lb) |
| 2P210670XS14 | others - dial |
| 2P210690XG14 | others - dial |
| 2P210690XS13 | others - dial |
| 2P2152207E | others - case |
| 2P219 | others - machine code |
| 2P21522075 | others - case |
| 82813970 | others - case ring |
| 2P215220 | others - case back |
| 0351236 | others - winding stem |
| 06T09CGH | others - hour hand |
| 06T09CGM | others - minute hand |
| 2BC065A1BCA | others - minute hand |
| 06T05NSM | others - minute hand |
| 06T11NSH | others - hour hand |
| 07SC25NS | others - second hand |
| 1BA045A1BNS | others - hour hand |
| 2BA065A1BNS | others - minute hand |
Caliber 2P21
