The Seiko 1F20-5D40 is a watch model based on the 1F20 movement.
Parts List
| REDN18JN01 | crystal |
| REDN18JN | crystal |
| 30M98NA1 | crown |
| 0H1700B01 | case back gasket - bezel gasket |
| 0H1700B0 | case back gasket |
| WGJ49G | band |
| BGA47K | band - leather band |
| BGJ79K | band - leather band |
| BGJ81K | band - leather band |
| WGA28G | band |
| BGJ80K | band |
| A110BS | others - push pin (for mb) |
| 1F200H98XS19 | others - dial |
| 1F200J08XB14 | others - dial |
| 1F200J08XG14 | others - dial |
| 1F200J18XS19 | others - dial |
| 1F200J60XG14 | others - dial |
| 1F200J70XB14 | others - dial |
| 1F205D40 | others - case back |
| 1F205D4025 | others - case |
| 1F205D4025Z | others - case |
| 1F209 | others - machine code |
| 82820980 | others - case ring |
| 0351807 | others - winding stem |
| DZ0041B01 | others - crown and stem gasket |
| 05Y16AGM | others - minute hand |
| 05Y16AGH | others - hour hand |
| 2CA052A0BNG | others - minute hand |
| 05Y02NGM | others - minute hand |
| 05Y04DAH | others - hour hand |
| 05Y40AGM | others - minute hand |
| 05Y04DAM | others - minute hand |
| 1CA035A0BNG | others - (24 hour hand) |
| 05Y02NGH | others - hour hand |
| 05Y40AGH | others - hour hand |
Caliber 1F20
