The Seiko 8420-5809 is a watch model based on the 8420 movement.
Parts List
| RE2N40SN00 | crystal |
| 25M10NA1 | crown |
| 0G2300N01 | case back gasket |
| DZ0040B01 | others - crown and stem gasket |
Caliber 8420
Seiko 8420-5809 Watch Guide
The Seiko 8420-5809 is a watch model based on the 8420 movement.
| RE2N40SN00 | crystal |
| 25M10NA1 | crown |
| 0G2300N01 | case back gasket |
| DZ0040B01 | others - crown and stem gasket |