The Seiko 1F20-5B10 is a watch model based on the 1F20 movement.
Parts List
| K04N12JN01 | crystal |
| K04N12JN | crystal |
| 30M98NA1 | crown |
| 0H1400B01 | case back gasket - case back gasket |
| 0H1400B0 | case back gasket |
| B5531G | band |
| B5531G-LKG | band - link |
| B5531G-BK4G | clasp - clasp |
| 81606439 | others - bracelet fixing pin |
| 81181919 | others - bracelet fixing pipe |
| 1F200B90XG14 | others - dial |
| 1F200C00XS14 | others - dial |
| 1F205B10 | others - case back |
| 1F205B1025 | others - case |
| 1F209 | others - machine code |
| 82814220 | others - case ring |
| 0351807 | others - winding stem |
| 05Y02FGM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
| 2CA052A0BNG | others - minute hand |
| 05Y02NGM | others - minute hand |
| 05Y02FGH | others - hour hand |
| 1CA035A0BNG | others - (24 hour hand) |
| 05Y02NGH | others - hour hand |
Caliber 1F20
