The Seiko 1N01-5A20 is a watch model based on the 1N01 movement.
Parts List
| RE3W32JM01 | crystal |
| RE3W32JM | crystal |
| 30MA2NA1 | crown - crown |
| 0A1600B01 | case back gasket |
| EZ0035B0 | case back gasket |
| G5159S | band |
| 07SC02NG | others - second hand |
| 0351807 | others - winding stem |
| 82822040 | others - case ring |
| 1N010C50X914 | others - dial |
| 1N015A20 | others - case back |
| 1N015A2079 | others - case |
| 1N019 | others - machine code |
| A100AS | others - push pin |
| EZ0035B01 | others - crown and stem gasket |
| 05T28DAM | others - minute hand |
| 05T28DAH | others - hour hand |
| RE3W32JM01 | crystal |
| RE3W32JM | crystal |
| 30MA2NA1 | crown - crown |
| 0A1600B01 | case back gasket |
| EZ0035B0 | case back gasket |
| G5159S | band |
| 07SC02NG | others - second hand |
| 0351807 | others - winding stem |
| 82822040 | others - case ring |
| 1N010C50X914 | others - dial |
| 1N015A20 | others - case back |
| 1N015A2079 | others - case |
| 1N019 | others - machine code |
| A100AS | others - push pin |
| EZ0035B01 | others - crown and stem gasket |
| 05T28DAM | others - minute hand |
| 05T28DAH | others - hour hand |
Caliber 1N01
