The Seiko 2P21-5C40 is a watch model based on the 2P21 movement.
Parts List
| BA2W28JM01 | crystal |
| 30MA2NA1 | crown - crown |
| 0A1700N0 | case back gasket |
| G5094C | band - metal band |
| G5094G | band - metal band |
| G5094G-BK5G | clasp - clasp |
| G5094C-BK5G | clasp - clasp |
| 06T30ZGH | hand - hour hand |
| 06T30ZGM | hand - minute hand |
| 07SC02NG | others - second hand |
| EZ0035B0A | others - crown and stem gasket |
| 0351236 | others - winding stem |
| 2P210G40X984 | others - dial |
| 2P210G40X994 | others - dial |
| 2P215C40 | others - case back |
| 2P215C4075 | others - case |
| 2P215C40SA | others - case |
| 2P219 | others - machine code |
| 82810360 | others - case ring |
| A120AS | others - push pin |
| EZ0035B01 | others - crown and stem gasket |
Caliber 2P21
