The Seiko 8420-742H is a watch model based on the 8420 movement.
Parts List
| RE5N02SH02 | crystal |
| 25M28NA1 | crown |
| 0G2300N01 | case back gasket |
| WPA18G | band - leather band |
| 08R02N1H | hand - hour hand |
| 08R02DGM | others - minute hand |
| 82721820 | others - case ring |
| 84202200XG14 | others - dial |
| 8420742H25 | others - case |
| 84209 | others - machine code |
| A180AS | others - push pin |
| 0354815 | others - winding stem |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
