The Seiko 8420-6120 is a watch model based on the 8420 movement.
Parts List
| SA8N42SN00 | crystal |
| 26M04EE3 | crown |
| 0G1601N01 | case back gasket - case back gasket |
| HI056 | others - other band |
| 81501405 | others - case back screw |
| 06R32DDH | others - hour hand |
| 06R32DDM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
