The Seiko 2C21-0400 is a watch model based on the 2C21 movement.
Parts List
| 185N31JN00 | crystal - crystal |
| 185A02JN02 | crystal - crystal (inorganic) |
| 35NR5NA1 | crown |
| 0H1550B01 | case back gasket |
| DZ0065B01 | case back gasket - button gasket |
| ZL43A | band - band |
| 3BA075F1BNG | others - second hand |
| 07SC17NG | others - second hand |
| 08P07DGH | others - hour hand |
| 08P07DGM | others - minute hand |
| 1AA050A3BNG | others - hour hand |
| 2AA075A3BNG | others - minute hand |
| 0351225 | others - winding stem |
| 82712510 | others - case ring |
| 2C21040025 | others - case |
| 2C2110 | others - machine code |
| 2C211590XG14 | others - dial |
| A110AS | others - push pin |
Caliber 2C21
