The Seiko 2C21-5540 is a watch model based on the 2C21 movement.
Parts List
| SA4W55HV01 | crystal - crystal |
| 32M25NA1 | crown - crown |
| 0F195BAA3 | case back gasket - case back gasket |
| 86572950 | crystal gasket - plastic gasket for crystal |
| MK55B | band - leather band |
| 07SC25NG | others - second hand |
| 3BA075F1BNG | others - second hand |
| 07P27DGM | others - minute hand |
| 2AA065A1BDG | others - minute hand |
| 2AA065A1BNG | others - minute hand |
| EB0055B01 | others - crown and stem gasket |
| 0351225 | others - winding stem |
| 82731910 | others - case ring |
| 2C2110 | others - machine code |
| 2C211290XS14 | others - dial |
| 2C2155407N | others - case |
| A120AS | others - push pin |
| 07P47NGH | others - hour hand |
| 1AA045A1BNG | others - hour hand |
Caliber 2C21
