The Seiko 8420-6990 is a watch model based on the 8420 movement.
Parts List
| ESAN48SH01 | crystal |
| 25M02NS3 | crown |
| 0H2395N01 | case back gasket |
| YK37Z | band - leather band |
| 08V02CGH | others - hour hand |
| A180AS | others - push pin |
| 08V18CGM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
