The Seiko 8420-5780 is a watch model based on the 8420 movement.
Parts List
| ES6N42SN00 | crystal - crystal |
| 25M02NA4 | crown - crown |
| 0G1800N01 | case back gasket |
| MK64A | band - band |
| MK63A | band - band |
| 06R20DGH | others - hour hand |
| 06R20DGM | others - minute hand |
| 0354815 | others - winding stem |
| 842057804L | others - case |
| 82705340 | others - case ring |
| 84205950XA15 | others - dial |
| 84205960XA25 | others - dial |
| A110AS | others - push pin |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
