The Seiko 2C21-5280 is a watch model based on the 2C21 movement.
Parts List
| BA3N99JN00 | crystal |
| 30N77NA1 | crown |
| 30N79NA5 | crown |
| 0F180NA11 | case back gasket - case back gasket |
| DZ0065B01 | case back gasket - button gasket |
| BJJ09G | band - leather band |
| WJJ11G | band - leather band |
| 06S07DGH | hand - hour hand |
| 06S07DGM | hand - minute hand |
| 06SS03NG | hand - second hand |
| A130AS | others - push pin (for lb) |
| 2C210720XG14 | others - dial |
| 2C2110 | others - machine code |
| 2C21528025 | others - case |
Caliber 2C21
