Pentacon Six P6 to Nikon Ai F Mount Lens adapter

For sale here is a Pentacon 6 to Nikon F Mount lens adapter. 

This is a unbranded adapter that is mechanical only, there are no electronic contacts connecting this to your Nikon DSLR or Mirrorless camera. 

Metering with this adapter will thus be completely manual, and the lens will need to be used in stop down metering mode.