The Seiko 1F20-5A50 is a watch model based on the 1F20 movement.
Parts List
| RECN28JN01 | crystal |
| RECN28JN | crystal |
| 30M98NA1 | crown |
| 0H1500N01 | case back gasket - case back gasket |
| 0H1500N0 | case back gasket |
| M5072G | band |
| M5072G-BK3G | clasp - clasp |
| T060BS | others - push pin |
| 0351807 | others - winding stem |
| 1F200A90XB14 | others - dial |
| 1F200A90XG14 | others - dial |
| 1F200B00XB15 | others - dial |
| 1F200B00XG15 | others - dial |
| 1F200B10XS14 | others - dial |
| 1F205A50 | others - case back |
| 1F205A5025 | others - case |
| 1F209 | others - machine code |
| 82812900 | others - case ring |
| 03Y04NGM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
| 03Y04FGM | others - minute hand |
| 03Y02NGH | others - hour hand |
| 03Y02FGH | others - hour hand |
Caliber 1F20
