The Seiko 8420-703H is a watch model based on the 8420 movement.
Parts List
| RE5N40SH02 | crystal |
| 25M28NA1 | crown |
| 0G1700N01 | case back gasket |
| 0Z0034B01 | case back gasket - crown and stem gasket |
Caliber 8420
Seiko 8420-703H Watch Guide
The Seiko 8420-703H is a watch model based on the 8420 movement.
| RE5N40SH02 | crystal |
| 25M28NA1 | crown |
| 0G1700N01 | case back gasket |
| 0Z0034B01 | case back gasket - crown and stem gasket |