The Seiko 2C21-0020 is a watch model based on the 2C21 movement.
Parts List
| 175A02JN02 | crystal - crystal |
| 175N15JN00 | crystal |
| 30N77NA1 | crown |
| 30N77NS1 | crown |
| 30N79NA5 | crown |
| 0H1500B01 | case back gasket - case back gasket |
| 0E150NA1S | case back gasket - case back gasket |
| DZ0065B01 | case back gasket - button gasket |
| DK35B | band - band |
| 07S17CHH | others - hour hand |
| 07S17CHM | others - minute hand |
| 07SS01NG | others - second hand |
| 83139430 | others - case ring |
| 2C210670XS29 | others - dial |
| 2C2110 | others - machine code |
| A110AS | others - push pin |
| 2C21002025 | others - case |
| 0351225 | others - winding stem |
Caliber 2C21
