The Seiko 6423-5040 is a watch model based on the 6423 movement.
Parts List
| SA2W50GN | crystal |
| 35M82NA1 | crown - crown |
| 35M82NS1 | crown - crown |
| 0Z2702N | case back gasket |
Caliber 6423
Other models with the same movement
| 6423-5000 |
| 6423-5010 |
| 6423-5020 |
| 6423-5030 |
| 6423-5050 |
| 6423-7000 |