The Seiko 8420-0040 is a watch model based on the 8420 movement.
Parts List
| 205N10SN00 | crystal |
| 25M02NA4 | crown - crown |
| 25M02NS4 | crown - crown |
| 0G1900N01 | case back gasket - case back gasket |
| 0Z0034B01 | case back gasket - crown and stem gasket |
| KK05A | band - band |
| KK06A | band - band |
| 08R12D2H | others - hour hand |
| 08R12D1H | others - hour hand |
| 08R12D1M | others - minute hand |
| 08R12D2M | others - minute hand |
| A120BS | others - push pin (for lb) |
| 84200060XG14 | others - dial |
| 84200060XS13 | others - dial |
| 82702860 | others - case ring |
| 8420004027 | others - case |
| 0354815 | others - winding stem |
| 8420004025 | others - case |
| 82301081 | others - bezel |
| 82301082 | others - bezel |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
