The Seiko 8420-5040 is a watch model based on the 8420 movement.
Parts List
| RE1N88SN00 | crystal |
| 25M02NE3 | crown - crown |
| 0Z0034B01 | case back gasket - crown and stem gasket |
| 0Z1800N01 | case back gasket |
| DK29A | band - leather band |
| A120AS | others - push pin |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
