The Seiko 8420-5370 is a watch model based on the 8420 movement.
Parts List
| ES4N44SN00 | crystal |
| 25M02NS3 | crown |
| 0G2100N01 | case back gasket - case back gasket |
| 0Z0034B01 | case back gasket - crown and stem gasket |
| ZK17A | band - leather band |
| ZK18A | band - leather band |
| A140BS | others - push pin |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
