The Seiko 1F20-1D50 is a watch model based on the 1F20 movement.
Parts List
| 140A08JZ0C | crystal - crystal |
| 140A08JZ0D | crystal - crystal |
| 25M24NS1 | crown |
| 25M24TN1 | crown - crown |
| 0F130BA1S | case back gasket - case back gasket |
| C062BB | band - band |
| C061AB | band - band |
| 1CE035L0BDG | others - hour hand |
| 1CE035L0BDS | others - hour hand |
| 2CE052L0BDG | others - minute hand |
| 2CE052L0BDS | others - minute hand |
| 0351807 | others - winding stem |
| 81190055 | others - bracelet fixing pipe |
| 81611939 | others - bracelet fixing pin |
| 82813320 | others - case ring |
| 1F201D5075 | others - case |
| 1F201D50 | others - case back |
| 1F201D507E | others - case |
| 1F202R60XA13 | others - dial |
| 1F202R60XA44 | others - dial |
| 1F205 | others - machine code |
| DZ0041B01 | others - crown and stem gasket |
Caliber 1F20
