The Seiko 8420-6439 is a watch model based on the 8420 movement.
Parts List
| 25M22NA1 | crown |
| 0Z0034B01 | case back gasket - crown and stem gasket |
| 0G2585N01 | case back gasket |
Caliber 8420
Seiko 8420-6439 Watch Guide
The Seiko 8420-6439 is a watch model based on the 8420 movement.
| 25M22NA1 | crown |
| 0Z0034B01 | case back gasket - crown and stem gasket |
| 0G2585N01 | case back gasket |