The Seiko 8420-7129 is a watch model based on the 8420 movement.
Parts List
| RE2N34SN00 | crystal |
| 25M08NA3 | crown - crown |
| 0Z0034B01 | case back gasket - crown and stem gasket |
| 0G1601N01 | case back gasket - case back gasket |
Caliber 8420
Seiko 8420-7129 Watch Guide