The Seiko 2C21-5400 is a watch model based on the 2C21 movement.
Parts List
| ESXN49JN00 | crystal |
| 32N09NA1 | crown |
| 0F140NA11 | case back gasket |
| 0E140BA1 | case back gasket |
| DH0100B01 | case back gasket - crown and stem gasket (4h) |
| R5001G | band - metal band |
| R5001S | band - metal band |
| R5001G-BK3G | clasp - clasp |
| 05P11DGH | hand - hour hand |
| 05P11DGM | hand - minute hand |
| 3BA075F1BNG | others - second hand |
| 1AA037A1BNG | others - hour hand |
| 2C210990XG14 | others - dial |
| 2C2110 | others - machine code |
| 2C211000XN14 | others - dial |
| 2C21540025 | others - case |
| 2C2154002H | others - case |
| B080AS | others - push pin |
| 06P17DGM | others - minute hand |
| 07SC04NG | others - second hand |
| 2AA057A1BNG | others - minute hand |
| 2AA055A1BDG | others - minute hand |
Caliber 2C21
