The Seiko 2C21-0240 is a watch model based on the 2C21 movement.
Parts List
| 185W17HN01 | crystal - crystal |
| 32M25NA1 | crown - crown |
| 0F155BAA1 | case back gasket - case back gasket |
| 86569090 | crystal gasket |
| 86561290 | bezel gasket - plastic gasket for bezel |
| ML43A | band - band |
| ML42A | band - band |
| 07P29NGH | others - hour hand |
| 07P41AGH | others - hour hand |
| 07P41AGM | others - minute hand |
| 07SC17NG | others - second hand |
| 3BA075F1BNG | others - second hand |
| 1AC047A1BAA | others - hour hand |
| 2AC070A1BAA | others - minute hand |
| 07P29NGM | others - minute hand |
| 1AA047A1BNG | others - hour hand |
| 2AA070A1BNG | others - minute hand |
| EB0055B01 | others - crown and stem gasket |
| 0351225 | others - winding stem |
| 2C21024075 | others - case |
| 82330851 | others - bezel |
| 82718430 | others - case ring |
| 2C2102407L | others - case |
| 2C210880XG14 | others - dial |
| 2C210890X999 | others - dial |
| 2C2110 | others - machine code |
| A120AS | others - push pin |
Caliber 2C21
