The Seiko 1F21-5A10 is a watch model based on the 1F21 movement.
Parts List
| RE2A20SR02 | crystal - crystal |
| ESKN24JN01 | crystal - crystal |
| 30M98NA1 | crown |
| 6M30A3NNG1 | crown - crown |
| 6M30A3SNW0 | crown - crown |
| 0F240NA1S | case back gasket - case back gasket |
| 0H1500N01 | case back gasket - case back gasket |
| WV89AZ | band - band |
| DC21A | band - band |
| WV90BZ | band - band |
| HC10A | band - other band |
| DC20A | band - band |
| DA3Y1KA | band - metal band |
| 07SC02NG | others - second hand |
| 05T02NGH | others - hour hand |
| 05T10NGM | others - minute hand |
| 04V10NSM | others - minute hand |
| 04V10NGM | others - minute hand |
| 1BA035A1BNG | others - hour hand |
| 1BA035A1BNS | others - hour hand |
| 2BA055A1BNG | others - minute hand |
| 2BA055A1BNS | others - minute hand |
| 3BA075F1BNG | others - second hand |
| 3BA075F1BNS | others - second hand |
| 0351807 | others - winding stem |
| DZ0040B01 | others - crown and stem gasket |
| 0351931 | others - winding stem |
| 1EFW5A1001D | others - case |
| 82841860 | others - case ring |
| 1EFW5A1002D | others - case |
| 1EFW0A20XB13 | others - dial |
| 1EFW0A20XS13 | others - dial |
| 1EFW0A20XS14 | others - dial |
| 1F210A20XG14 | others - dial |
| 1F210A20XS14 | others - dial |
| 1F219 | others - machine code |
| A110AS | others - push pin |
| 1F215A1026 | others - case |
| 82812660 | others - case ring |
| 1F215A10 | others - case back |
| 1F215A102N | others - case |
| 04V10NGH | others - hour hand |
| DZ0041B01 | others - crown and stem gasket |
| 04V10NSH | others - hour hand |