The Seiko 8420-5050 is a watch model based on the 8420 movement.
Parts List
| ES2N66SN00 | crystal |
| 25M02NX3 | crown - crown |
| 0Z1900N01 | case back gasket |
| 0Z0034B01 | case back gasket - crown and stem gasket |
| HI034 | others - other band |
| HI035 | others - other band |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
