The Seiko 6309-8020 is a watch model based on the 6309 movement.
Parts List
| 310T18ANG | crystal |
| 310T18ANS | crystal - plastic crystal |
| 45M30NG | crown |
| 45M30NS | crown |
| FH2980B | case back gasket |
| DJ0060B | others - crown gasket |
Caliber 6309
Seiko 6309-8020 Watch Guide