The Seiko 8420-6740 is a watch model based on the 8420 movement.
Parts List
| RE3N28SN00 | crystal |
| 25M02NE3 | crown - crown |
| 0G1900N01 | case back gasket - case back gasket |
| ZK59Z | band - leather band |
| A140AS | others - push pin |
| 06RA0DGH | others - hour hand |
| 06RA0DGM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
