The Seiko 2C21-5520 is a watch model based on the 2C21 movement.
Parts List
| ESAW19HN01 | crystal |
| 32M25NA1 | crown - crown |
| 0F170BAA3 | case back gasket - case back gasket |
| 86573070 | crystal gasket |
| ML63A | band - leather band |
| PL33A | band - leather band |
| 3BA075F1BNG | others - second hand |
| 07SC17NG | others - second hand |
| EB0055B01 | others - crown and stem gasket |
| 0351225 | others - winding stem |
| 2C2110 | others - machine code |
| 2C211260XB14 | others - dial |
| 2C211260XS14 | others - dial |
| 2C21552075 | others - case |
| 82732190 | others - case ring |
| A110AS | others - push pin |
| 08P07NGM | others - minute hand |
| 1AA050A1BNG | others - hour hand |
| 2AA075A1BNG | others - minute hand |
| 08P07NGH | others - hour hand |
Caliber 2C21
