The Seiko 8420-6660 is a watch model based on the 8420 movement.
Parts List
| ES9N24SN00 | crystal |
| 25M02NE3 | crown - crown |
| 0G1500N01 | case back gasket |
| WI091 | others - other band |
| 06R44DSH | others - hour hand |
| 06R44DSM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
