The Seiko 8420-5590 is a watch model based on the 8420 movement.
Parts List
| K01N46SN00 | crystal |
| 26M02EE3 | crown |
| 26M02EX3 | crown |
| 0G1601N01 | case back gasket - case back gasket |
| WI053 | others - other band |
| WI054 | others - other band |
| 05R26D1H | others - hour hand |
| 05R26D1M | others - minute hand |
| 05R26D2H | others - hour hand |
| DZ0041B01 | others - crown and stem gasket |
| 05R26D2M | others - minute hand |
Caliber 8420
