The Seiko 4N01-0020 is a watch model based on the 4N01 movement.
Parts List
| 210N55JM01 | crystal |
| 210N55JM | crystal |
| 30M57NA1 | crown - crown |
| 30M57NN1 | crown - crown |
| 0F170BAA | case back gasket |
| 0F170BAA3 | case back gasket - case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| WJA40E | band |
| 3BA125F1BNG | others - second hand |
| 0351155 | others - winding stem |
| 4N010020 | others - case back |
| 4N010020WG | others - case |
| 4N010110XB14 | others - dial |
| 4N0161 | others - machine code |
| 82833750 | others - case ring |
| A130BS | others - push pin |
| 09SC31NG | others - second hand |
| 08T17DGM | others - minute hand |
| 08T17DGH | others - hour hand |