The Seiko 8420-7389 is a watch model based on the 8420 movement.
Parts List
| RE5N40SH01 | crystal |
| 25M28NA1 | crown |
| 0G1700N01 | case back gasket |
| BHA18G | band - leather band |
| KHA03G | band - leather band |
| WHA11G | band - leather band |
| 05R04NGH | others - hour hand |
| 0354815 | others - winding stem |
| 82723840 | others - case ring |
| 84202160XG14 | others - dial |
| 84207 | others - machine code |
| 8420738925 | others - case |
| A120AS | others - push pin |
| 05R01DGM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
