The Seiko 1N01-0C20 is a watch model based on the 1N01 movement.
Parts List
| 180W48JU01 | crystal |
| 180W48JU | crystal |
| 30MA2NA1 | crown - crown |
| 0A1700B01 | case back gasket |
| EZ0035B0 | case back gasket |
| WHA28E | band |
| WHA28G | band |
| 3BA075F0BNG | others - second hand |
| 1BH047L0BDG | others - hour hand |
| 0351807 | others - winding stem |
| 82822060 | others - case ring |
| 1N010C20 | others - case back |
| 1N010C207N | others - case |
| 1N010C20WG | others - case |
| 1N010E00XB24 | others - dial |
| 1N010E00XG24 | others - dial |
| 1N019 | others - machine code |
| A120AS | others - push pin |
| EZ0035B01 | others - crown and stem gasket |
| 2BH070L0BDG | others - minute hand |
Caliber 1N01
