The Seiko 1N01-5A90 is a watch model based on the 1N01 movement.
Parts List
| RE2N44GN00 | crystal |
| RE2N44GN | crystal |
| 30M98NA1 | crown |
| 0E180NA1S | case back gasket - case back gasket |
| 0E180NA1 | case back gasket |
| 4EH0KB | band - band |
| 4EH1KB | band - band |
| 4EH2KB | band - band |
| 3BA075F0BNG | others - second hand |
| 1BE040L0BDG | others - hour hand |
| 2BE060L0BDG | others - minute hand |
| 0351807 | others - winding stem |
| 82833600 | others - case ring |
| 1N015A9025Z | others - case |
| 1N015A90 | others - case back |
| 1N011C28XB14 | others - dial |
| 1N011C28XG14 | others - dial |
| 1N011C28XS14 | others - dial |
| 1N011C38XS14 | others - dial |
| 1N011C38XS24 | others - dial |
| 1N019 | others - machine code |
| A140AS | others - push pin |
| DZ0041B01 | others - crown and stem gasket |
| 2BH055A0BAA | others - minute hand |
| 1BH035A0BAA | others - hour hand |
Caliber 1N01
