The Seiko 8420-7439 is a watch model based on the 8420 movement.
Parts List
| RE3N42SM01 | crystal |
| 25M22NA1 | crown |
| 0G2585N01 | case back gasket |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
Seiko 8420-7439 Watch Guide
The Seiko 8420-7439 is a watch model based on the 8420 movement.
| RE3N42SM01 | crystal |
| 25M22NA1 | crown |
| 0G2585N01 | case back gasket |
| DZ0041B01 | others - crown and stem gasket |