The Seiko 1F20-1C90 is a watch model based on the 1F20 movement.
Parts List
| 190A14SB0C | crystal - crystal |
| 6M35A9NNG1 | crown - crown |
| 0F180NA1S | case back gasket - case back gasket |
| 43K1LZ | band - band |
| 43K1LZ-LKG | band - link |
| 43K1LZ-BK2G | clasp - buckle |
| 43K1LZ-PB1 | clasp - parts for buckle |
| 2CB080A0BNG | others - minute hand |
| 0351807 | others - winding stem |
| 1CB055A0BNG | others - hour hand |
| 81604259 | others - bracelet fixing pin |
| 81190055 | others - bracelet fixing pipe |
| 82836860 | others - case ring |
| 1F201C90XBZ | others - case |
| 1F201C90 | others - case back |
| 1F202M38XS34 | others - dial |
| 1F205 | others - machine code |
| DZ0041B01 | others - crown and stem gasket |
Caliber 1F20
