The Seiko 5E21-5C10 is a watch model based on the 5E21 movement.
Parts List
| RE1A16SZ0C | crystal - crystal |
| RE1A16SZ0D | crystal - crystal |
| 30MA2NA1 | crown - crown |
| 30MA2NB1 | crown - crown |
| 0F250NA1S | case back gasket |
| D0N3CG | band - band |
| WP25BW | band - band |
| DAW1AW | band - band |
| D0N3CG-LK00 | band - link |
| D0N3CG-BK00 | clasp - clasp |
| 1BF055A1BNG | others - hour hand |
| 2BB080A0BNG | others - minute hand |
| 2BF080A1BNG | others - minute hand |
| 3BA090F1BNG | others - second hand |
| 1BB055A0BNG | others - hour hand |
| 5E215 | others - machine code |
| 5E215C20XS14 | others - dial |
| 5E215C40XS14 | others - dial |
| 5E215C50XG19 | others - dial |
| 87020283 | others - back plate |
| A170BS | others - push pin |
| 5E215C1075 | others - case |
| 82836100 | others - case ring |
| 5E215C10 | others - case back |
| 5E215C107H | others - case |
| 5E215C107N | others - case |
| 0351624 | others - winding stem |
| D0N3CG-BKPP | others - spring bar for buckle/clasp |
| EZ0035B01 | others - crown and stem gasket |