The Seiko 8420-6720 is a watch model based on the 8420 movement.
Parts List
| RE4N36SN00 | crystal |
| 27M02EEA | crown |
| 27M02EX3 | crown |
| 0G1700N01 | case back gasket |
| GI127 | others - other band |
| 05R36E1H | others - hour hand |
| 05R36E1M | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
