The Seiko 8420-710A is a watch model based on the 8420 movement.
Parts List
| RE1N90GN00 | crystal |
| 25M22NA1 | crown |
| 0H2100N01 | case back gasket - case back gasket |
| MK20B | band - leather band |
| 0354815 | others - winding stem |
| 05R46CGH | others - hour hand |
| 82723920 | others - case ring |
| 84201800XN14 | others - dial |
| 8420710AJM | others - case |
| A140AS | others - push pin |
| 05R46CGM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
