Dynamo porsche 356 or beetle

Hi, I sell dynamo model porsche 356, the dynamo has an external diameter of 90 mm and is 12 volts. It also mounts on the 6-volt beetles with modified 12-volt system to maintain the original appearance as this dynamo has a diameter of 90 mm (like the original 6 volt) but internally is 12 volts.
The dynamo is new, it was mounted on a volkswagen industrial engine that had never been used, even for 5 minutes, so it is like new.
Attached there is also a picture of the piston cylinder that were mounted on this new engine, you can safely see that the piston is like new.
Price 400 euros negotiable. For photos or other info contact by mail, thanks.