The Seiko 8420-5660 is a watch model based on the 8420 movement.
Parts List
| ES5N80SN00 | crystal |
| 25M02NS3 | crown |
| 0G2100N01 | case back gasket - case back gasket |
| DI037 | others - other band |
| 09V02DGH | others - hour hand |
| 09V02DGM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
