The Seiko 2C21-5310 is a watch model based on the 2C21 movement.
Parts List
| K05N63JN00 | crystal - crystal (inorganic) |
| 30N73NA1 | crown - crown |
| 0G1600B01 | case back gasket - case back gasket |
| DZ0065B01 | case back gasket - button gasket |
| TT15A | band - metal band |
| 05SS01NG | others - second hand |
| 82718730 | others - case ring |
| 2C210790XG14 | others - dial |
| 2C2110 | others - machine code |
| 2C21531025 | others - case |
| 81606439 | others - bracelet fixing pin |
| 81180229 | others - bracelet fixing pipe |
| 0351225 | others - winding stem |
| 05S05DGH | others - hour hand |
| 05S05DGM | others - minute hand |
Caliber 2C21
