The Seiko 8420-7399 is a watch model based on the 8420 movement.
Parts List
| RE4N32SM02 | crystal |
| 25M28NA1 | crown |
| 0H2395N01 | case back gasket |
| 0Z0034B01 | case back gasket - crown and stem gasket |
Caliber 8420
Seiko 8420-7399 Watch Guide
The Seiko 8420-7399 is a watch model based on the 8420 movement.
| RE4N32SM02 | crystal |
| 25M28NA1 | crown |
| 0H2395N01 | case back gasket |
| 0Z0034B01 | case back gasket - crown and stem gasket |