The Seiko 8420-5939 is a watch model based on the 8420 movement.
Parts List
| RE2N48SN00 | crystal |
| 25M10NA1 | crown |
| 0G2585N01 | case back gasket |
| DZ0040B01 | others - crown and stem gasket |
Caliber 8420
Seiko 8420-5939 Watch Guide
The Seiko 8420-5939 is a watch model based on the 8420 movement.
| RE2N48SN00 | crystal |
| 25M10NA1 | crown |
| 0G2585N01 | case back gasket |
| DZ0040B01 | others - crown and stem gasket |