The Seiko 2C21-5590 is a watch model based on the 2C21 movement.
Parts List
| SA4W67HM01 | crystal - crystal |
| SA4W67HN01 | crystal - crystal |
| 35E05NG1 | crown - crown |
| 0F215BAA3 | case back gasket - case back gasket |
| 86573670 | crystal gasket - plastic gasket for crystal |
| HK18B | band - band |
| HK17B | band - band |
| 3BA075F1BAB | others - second hand |
| 07P99APH | others - hour hand |
| 07P99APM | others - minute hand |
| 07P99ASH | others - hour hand |
| 07P99ASM | others - minute hand |
| 07SC17EB | others - second hand |
| 08SC41XR | others - second hand |
| 3BA075F1BAF | others - second hand |
| 0351225 | others - winding stem |
| EB0055B0A | others - crown and stem gasket |
| 2C21559061 | others - case |
| 82733450 | others - case ring |
| 2C2155906B | others - case |
| 2C2110 | others - machine code |
| 2C211370XB19 | others - dial |
| 2C211370XN19 | others - dial |
| A130BS | others - push pin |
Caliber 2C21
