The Seiko 1N00-5B20 is a watch model based on the 1N00 movement.
Parts List
| ESHN08JN01 | crystal |
| ESHN08JN | crystal |
| 30M98NA1 | crown |
| 0H1500B01 | case back gasket - case back gasket |
| 0H1500B0 | case back gasket |
| B5597G | band |
| B5597G-BK3G | clasp - clasp |
| 0351807 | others - winding stem |
| 1N000D60XB14 | others - dial |
| 1N000D60XG14 | others - dial |
| 1N000D70XS19 | others - dial |
| 1N005B20 | others - case back |
| 1N005B2025 | others - case |
| 1N009 | others - machine code |
| 82822080 | others - case ring |
| B080AS | others - push pin |
| DZ0041B01 | others - crown and stem gasket |
| 04Y04NGM | others - minute hand |
| 05Y08NGH | others - hour hand |
Caliber 1N00
