The Seiko 1F20-5J50 is a watch model based on the 1F20 movement.
Parts List
| ESLN38SK01 | crystal |
| 30M62NA4 | crown |
| 30M62NS5 | crown |
| 0H1900B01 | case back gasket - case back gasket |
| HZ07B | band - metal band |
| HZ08B | band - metal band |
| 2CX065S0BCA | hand - minute hand |
| 0351807 | others - winding stem |
| 1CX045S0BCA | others - hour hand |
| 81606439 | others - bracelet fixing pin |
| 81180229 | others - bracelet fixing pipe |
| 82820780 | others - case ring |
| 1F201K60XL15 | others - dial |
| 1F201K60XS15 | others - dial |
| 1F205 | others - machine code |
| 1F205J50 | others - case back |
| 1F205J50CC | others - case |
| 1F205J50CE | others - case |
Caliber 1F20
