The Seiko 8420-7820 is a watch model based on the 8420 movement.
Parts List
| K01N98SN00 | crystal |
| 25M16EE3 | crown |
| 0G1800N01 | case back gasket |
| WI088 | others - other band |
| 05V46JGH | others - hour hand |
| 05V46JGM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
