The Seiko 1F20-5090 is a watch model based on the 1F20 movement.
Parts List
| SA1A37JN02 | crystal |
| 6M30B9SNW0 | crown - crown |
| 6M30B9NNG0 | crown - crown |
| 0F150BAA5 | case back gasket - case back gasket |
| 0F150BA1S | case back gasket - case back gasket |
| D086AB | band - metal band |
| D086BB | band - metal band |
| 1CA037A3BNG | others - hour hand |
| 0351807 | others - winding stem |
| 1F200250XS19 | others - dial |
| 1F200250XS29 | others - dial |
| 1F205 | others - machine code |
| 1F205090 | others - case back |
| 1F20509075A | others - case |
| 1F2050907EA | others - case |
| 82870210 | others - case ring |
| T060AS | others - push pin |
| DZ0040B01 | others - crown and stem gasket |
| 1CA037A3BNS | others - hour hand |
| 2CA057A3BNG | others - minute hand |
| 2CA057A3BNS | others - minute hand |
Caliber 1F20
