The Seiko 8420-5129 is a watch model based on the 8420 movement.
Parts List
| ES3N12SN | crystal |
| 25M04NA1 | crown - crown |
| 0Z1900N01 | case back gasket |
| 0Z0034B01 | case back gasket - crown and stem gasket |
Caliber 8420
Seiko 8420-5129 Watch Guide
The Seiko 8420-5129 is a watch model based on the 8420 movement.
| ES3N12SN | crystal |
| 25M04NA1 | crown - crown |
| 0Z1900N01 | case back gasket |
| 0Z0034B01 | case back gasket - crown and stem gasket |