The Seiko 4N00-5631 is a watch model based on the 4N00 movement.
Parts List
| K00A57JN02 | crystal |
| K00A57JN | crystal |
| 6M30A3NNG0 | crown - crown |
| 6M30A3NN | crown |
| 0H1800B01 | case back gasket - case back gasket |
| 0H1800B0 | case back gasket |
| WFA32K | band |
| A100BS | others - push pin (for mb) |
| 4N001721XS19 | others - dial |
| 4N005631 | others - case back |
| 4N00563125 | others - case |
| 4N0061 | others - machine code |
| 82852630 | others - case ring |
| 0351155 | others - winding stem |
| DZ0040B01 | others - crown and stem gasket |
| 06Y37AGM | others - minute hand |
| 06Y37AGH | others - hour hand |