The Seiko 8420-6770 is a watch model based on the 8420 movement.
Parts List
| ESAN10GN00 | crystal |
| 25M22NA1 | crown |
| 0G1900N01 | case back gasket - case back gasket |
| MK09B | band - leather band |
| MK10B | band - leather band |
| A130AS | others - push pin (for lb) |
| 82720580 | others - case ring |
| 84201370XS18 | others - dial |
| 84201370XY18 | others - dial |
| 84206770FY | others - case |
| 0354815 | others - winding stem |
| 07R38CGH | others - hour hand |
| 07R38CGM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
