The Seiko 7009-8640 is a watch model based on the 7009 movement.
Instruction manual of the watch
Parts List
| 300W81LZ10 | crystal |
| 40M09NS1 | crown |
| 40M09NA1 | crown |
| FH2920B03 | case back gasket |
| EJ0060B01 | others - crown gasket |
Caliber 7009
Seiko 7009-8640 Watch Guide