The Seiko 2P21-5B40 is a watch model based on the 2P21 movement.
Parts List
| SA4W22GN00 | crystal - crystal |
| 30MA2NA1 | crown - crown |
| 0A1600N01 | case back gasket |
| 86564300 | crystal gasket - plastic gasket for crystal |
| DL41A | band - band |
| 07SC02NG | others - second hand |
| 0351236 | others - winding stem |
| 2P210C40XG14 | others - dial |
| 2P215B4075 | others - case |
| 2P219 | others - machine code |
| 82801680 | others - case ring |
| A100AS | others - push pin |
| 06T22NGH | others - hour hand |
| EZ0035B01 | others - crown and stem gasket |
| 06T04NGM | others - minute hand |
Caliber 2P21
