The Seiko 8420-725A is a watch model based on the 8420 movement.
Parts List
| RE6N38SM01 | crystal - crystal |
| 25M32NS3 | crown - crown |
| 0H1720N01 | case back gasket - case back gasket |
| ZB05A | band - band |
| 05R22DAH | others - hour hand |
| 05R22DAM | others - minute hand |
| 81606439 | others - bracelet fixing pin |
| 81180229 | others - bracelet fixing pipe |
| 82730560 | others - case ring |
| 8420725AHM | others - case |
| 84202720XB13 | others - dial |
| 0354815 | others - winding stem |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
