The Seiko 1N00-5B90 is a watch model based on the 1N00 movement.
Parts List
| K01N76JN01 | crystal |
| K01N76JN | crystal |
| 30M98NA1 | crown |
| 0H1400B01 | case back gasket - case back gasket |
| 0H1400B0 | case back gasket |
| B5635K | band |
| B5635K-LKG | band - link |
| B5635K-BK4G | clasp - clasp |
| 81606439 | others - bracelet fixing pin |
| 81180229 | others - bracelet fixing pipe |
| 82821600 | others - case ring |
| 1N000H88XB14 | others - dial |
| 1N000H88XG14 | others - dial |
| 1N000H98XS19 | others - dial |
| 1N005B90 | others - case back |
| 1N005B9025Z | others - case |
| 1N009 | others - machine code |
| 0351807 | others - winding stem |
| DZ0041B01 | others - crown and stem gasket |
| 04Y06NGM | others - minute hand |
| 05Y34AGM | others - minute hand |
| 04Y06NGH | others - hour hand |
| 05Y40AGH | others - hour hand |
Caliber 1N00
