The Seiko 1F20-5B50 is a watch model based on the 1F20 movement.
Parts List
| K04N10JN01 | crystal |
| K04N10JN | crystal |
| 30M98NA1 | crown |
| 0H1300B01 | case back gasket |
| 0H1300B0 | case back gasket |
| Z5323G | band |
| Z5323G-LKG | band - link |
| Z5323G-PB1 | clasp - parts for buckle/clasp |
| Z5323G-BK4G | clasp - clasp |
| 0351807 | others - winding stem |
| 81182699 | others - bracelet fixing pipe |
| 81609399 | others - bracelet fixing pin |
| 82813320 | others - case ring |
| 1F200C70XG14 | others - dial |
| 1F200C80XB14 | others - dial |
| 1F205B50 | others - case back |
| 1F205B5025 | others - case |
| 1F209 | others - machine code |
| 04Y02DAM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
| 04Y02DAH | others - hour hand |
| K04N10JN01 | crystal |
| K04N10JN | crystal |
| 30M98NA1 | crown |
| 0H1300B01 | case back gasket |
| 0H1300B0 | case back gasket |
| Z5323G | band |
| Z5323G-LKG | band - link |
| Z5323G-PB1 | clasp - parts for buckle/clasp |
| Z5323G-BK4G | clasp - clasp |
| 0351807 | others - winding stem |
| 81182699 | others - bracelet fixing pipe |
| 81609399 | others - bracelet fixing pin |
| 82813320 | others - case ring |
| 1F200C70XG14 | others - dial |
| 1F200C80XB14 | others - dial |
| 1F205B50 | others - case back |
| 1F205B5025 | others - case |
| 1F209 | others - machine code |
| 04Y02DAM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
| 04Y02DAH | others - hour hand |
Caliber 1F20
