The Seiko 1N00-0B20 is a watch model based on the 1N00 movement.
Parts List
| 155N50JN01 | crystal |
| 155N50JN | crystal |
| 30M98NA1 | crown |
| 0H1500B01 | case back gasket - case back gasket |
| 0H1500B0 | case back gasket |
| Z5377K | band |
| Z5377G | band |
| Z5377G-LKG | band - link |
| Z5377K-LKG | band - link |
| Z5377G-BK4G | clasp - clasp |
| Z5377K-BK4G | clasp - clasp |
| 81180229 | others - bracelet fixing pipe |
| 81604259 | others - bracelet fixing pin |
| 82821520 | others - case ring |
| 1N000B20 | others - case back |
| 1N000B2025 | others - case |
| 1N000B2025Z | others - case |
| 1N000F60XG14 | others - dial |
| 1N000F68XG14 | others - dial |
| 1N000F70XB14 | others - dial |
| 1N000F78XB14 | others - dial |
| 1N000H10XS19 | others - dial |
| 1N000H18XS19 | others - dial |
| 1N009 | others - machine code |
| 0351807 | others - winding stem |
| DZ0041B01 | others - crown and stem gasket |
| 06Y28DAM | others - minute hand |
| 06Y28DAH | others - hour hand |
| 2CC067A0BAA | others - minute hand |
| 06Y34FGM | others - minute hand |
| 06Y08FGH | others - hour hand |
Caliber 1N00
