The Seiko 8420-5940 is a watch model based on the 8420 movement.
Parts List
| K01N52SN00 | crystal |
| 25M16EE3 | crown |
| 0Z1601N01 | case back gasket |
| WI062 | others - other band |
| 06R11DGH | others - hour hand |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
Seiko 8420-5940 Watch Guide