The Seiko 2P21-5C3A is a watch model based on the 2P21 movement.
Parts List
| SA9W28JN01 | crystal |
| 30MA2NB1 | crown - crown |
| 0A1800N01 | case back gasket |
| 86580800 | crystal gasket |
| PK19B | band - leather band |
| 07SC02NG | others - second hand |
| A130AS | others - push pin (for lb) |
| 2P210F70XB12 | others - dial |
| 2P215C3A | others - case back |
| 2P215C3A75 | others - case |
| 2P219 | others - machine code |
| 82810160 | others - case ring |
| 0351236 | others - winding stem |
| 07T06N1H | others - hour hand |
| EZ0035B01 | others - crown and stem gasket |
| 07T06N1M | others - minute hand |
Caliber 2P21
