529-Ebay quad scheune hamburg finde ich gut unknown Arabic test design sample number license plate

n October 2016 Ebay seller quad_scheune_hamburg_finde_ich_gut from Germany was trying to sell this sample plate. He is selling it as used which it is not.

This is a German manufacturer’s sample or test design and has come straight from the factory.
Very pretty but which country, if any, it was supposed to be for and when it was created is unknown. Nothing like this has ever been seen on the roads of any Arab country.