The Seiko 8420-7830 is a watch model based on the 8420 movement.
Parts List
| K02N04SN00 | crystal |
| 26M04EX3 | crown |
| 0H1500N01 | case back gasket - case back gasket |
| 04V08JSM | others - minute hand |
| WI169 | others - other band |
| 81501406 | others - screw |
| 04V08JSH | others - hour hand |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
