The Seiko 2P21-0100 is a watch model based on the 2P21 movement.
Parts List
| 215W19HN01 | crystal |
| 30M41NG1 | crown |
| 30M41NS1 | crown |
| 0Z0034B01 | case back gasket - crown and stem gasket |
| 0F170BAA3 | case back gasket - case back gasket |
| 86582250 | crystal gasket |
| 86582255 | crystal gasket |
| ML57A | band - band |
| ML56A | band - leather band |
| ML58A | band - leather band |
| ML59A | band - leather band |
| 2BA085A3BAJ | hand - minute hand |
| 2BA085A3BNB | others - minute hand |
| 3BA125F1BNS | others - second hand |
| 09SC31NS | others - second hand |
| 08T03NBM | others - minute hand |
| 1BA060A3BNB | others - hour hand |
| 0351236 | others - winding stem |
| 2P210100WE | others - case |
| 82810390 | others - case ring |
| 2P210100 | others - case back |
| 2P21010061 | others - case |
| 2P2101006B | others - case |
| 2P210350XS19 | others - dial |
| 2P210480XB19 | others - dial |
| 2P210480XS19 | others - dial |
| 2P210480XY19 | others - dial |
| 2P211050X919 | others - dial |
| 2P219 | others - machine code |
| A140AS | others - push pin |
| 08T03CLM | others - minute hand |
| 08T03DBM | others - minute hand |
| 08T35DBH | others - hour hand |
| 08T35DBM | others - minute hand |
| 09T11CLH | others - hour hand |
| 09T11DBH | others - hour hand |
| 1BA060A3BAJ | others - hour hand |
Caliber 2P21
