The Seiko 1F20-1C20 is a watch model based on the 1F20 movement.
Parts List
| 190A02SN02 | crystal - crystal (sapphire) |
| 190A02SN | crystal |
| 6M35A9NNG1 | crown - crown |
| 6M35A9NNW0 | crown |
| 6M35A9NN | crown |
| 0F180NA1S | case back gasket - case back gasket |
| 0F180NA1 | case back gasket |
| 43K0JZ | band - band |
| 43K0KZ | band - band |
| 43K0LZ | band - band |
| 43K0JZ-LKS | band - link |
| 43K0KZ-LKG | band - link |
| 43K0LZ-LKG | band - link |
| 43K0KZ-BK1G | clasp - buckle |
| 43K0KZ-PB3 | clasp - parts for buckle |
| 43K0LZ-BK2G | clasp - buckle |
| 43K0LZ-PB3 | clasp - parts for buckle |
| 43K0JZ-BK2S | clasp - buckle |
| 43K0JZ-PB3 | clasp - parts for buckle |
| 2CB080A0BNG | others - minute hand |
| 81604259 | others - bracelet fixing pin |
| 81190055 | others - bracelet fixing pipe |
| 1F201C2061Z | others - case |
| 82836860 | others - case ring |
| 1F201C20 | others - case back |
| 1F201C2075Z | others - case |
| DZ0040B01 | others - crown and stem gasket |
| 0351807 | others - winding stem |
| 1CB055A0BNG | others - hour hand |
| 1F202L68XL14 | others - dial |
| 1F202L68XS14 | others - dial |
| 1F202M38XS34 | others - dial |
| 1F205 | others - machine code |
| 1F201C2098Z | others - case |
| DZ0041B01 | others - crown and stem gasket |
Caliber 1F20
