The Seiko 8420-5989 is a watch model based on the 8420 movement.
Parts List
| SA8N46SN00 | crystal |
| 25M04EE1 | crown |
| 0G1800N01 | case back gasket |
| BGA02G | band - leather band |
| BGA05G | band - leather band |
| 0354815 | others - winding stem |
| 06R11DGH | others - hour hand |
| 82708900 | others - case ring |
| 84200410XS14 | others - dial |
| 8420598943 | others - case |
| 84209 | others - machine code |
| A110AS | others - push pin |
| 06R11DGM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
