The Seiko 1F20-5B30 is a watch model based on the 1F20 movement.
Parts List
| RECN36JN01 | crystal |
| RECN36JN | crystal |
| 30M98NA1 | crown |
| 30MF6NA6 | crown |
| 0H1500B01 | case back gasket - case back gasket |
| 0H1500B0 | case back gasket |
| Q5026G | band |
| Q5026C | band - metal band |
| Q5026C-LKG | band - link |
| Q5026G-LKG | band - link |
| Q5026G-BK4G | clasp - clasp |
| Q5026C-BK4G | clasp - clasp |
| Q5026C-EPG | others - endpiece |
| Q5026G-EPG | others - endpiece |
| 0351807 | others - winding stem |
| 81606439 | others - bracelet fixing pin |
| 81180229 | others - bracelet fixing pipe |
| 1F200C10XG14 | others - dial |
| 1F200C10XS14 | others - dial |
| 1F200C20XS19 | others - dial |
| 1F205B30 | others - case back |
| 1F205B3025 | others - case |
| 1F205B3025A | others - case |
| 1F205B302N | others - case |
| 1F209 | others - machine code |
| 82812900 | others - case ring |
| DZ0041B01 | others - crown and stem gasket |
| 04Y15DGM | others - minute hand |
| 04Y15DGH | others - hour hand |
| 04Y08FGM | others - minute hand |
| 04Y06FGH | others - hour hand |
Caliber 1F20
