The Seiko 7439-5020 is a watch model based on the 7439 movement.
Parts List
| ESHN31HN00 | crystal |
| 30N69NA1 | crown |
| 30N31DA5 | crown |
| DZ0065B01 | case back gasket - button gasket |
| 0H2400B01 | case back gasket - case back gasket |
Caliber 7439
Seiko 7439-5020 Watch Guide