The Seiko 8420-7649 is a watch model based on the 8420 movement.
Parts List
| SADN02SV01 | crystal |
| 25M28NA1 | crown |
| 0H1610N01 | case back gasket |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
Seiko 8420-7649 Watch Guide
The Seiko 8420-7649 is a watch model based on the 8420 movement.
| SADN02SV01 | crystal |
| 25M28NA1 | crown |
| 0H1610N01 | case back gasket |
| DZ0041B01 | others - crown and stem gasket |