The Seiko 1N00-5A20 is a watch model based on the 1N00 movement.
Parts List
| REDN28JM01 | crystal |
| REDN28JM | crystal |
| 30M98NA1 | crown |
| 0H1500B01 | case back gasket - case back gasket |
| 0E150NA1S | case back gasket - case back gasket |
| B5584L | band |
| B5584C | band |
| B5584C-LKG | band - link |
| B5584L-LKG | band - link |
| B5584C-BK4G | clasp - clasp |
| B5584L-BK4G | clasp - clasp |
| 81180229 | others - bracelet fixing pipe |
| 81604259 | others - bracelet fixing pin |
| 82822040 | others - case ring |
| 1N000A48XS14 | others - dial |
| 1N000D20XG14 | others - dial |
| 1N005A20 | others - case back |
| 1N005A202E | others - case |
| 1N005A202EZ | others - case |
| 1N009 | others - machine code |
| 0351807 | others - winding stem |
| 2CF045L0BDG | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
| 04Y32DGM | others - minute hand |
| 04Y32DGH | others - hour hand |
Caliber 1N00
