The Seiko 8420-7800 is a watch model based on the 8420 movement.
Parts List
| ESBN04SN00 | crystal |
| 26M06EE3 | crown |
| 0Z0034B01 | case back gasket - crown and stem gasket |
| 0H2395N01 | case back gasket |
| 07R14DGH | others - hour hand |
| 07R14DGM | others - minute hand |
| GI106 | others - other band |
| 81501405 | others - case back screw |
Caliber 8420
