In September 2017 Ebay seller artmab-gameshop from Swarzedz in Poland was selling these replica Dubai, Califonria and Swiss plates. He sells many other types of replica and I think he has been selling plates like this for some time.
The Dubai plate has the words and the serial letter in the wrong places, the Swiss plates have the wrong blanks and the wrong font but the California plates (he has already sold one set – I guess with the same number) are very close to the real plates. He does not say if they are made of Aluminium or steel but the genuine plates are steel plates. He says there is a very small ‚REPLICA‘ on the back of these plates
The problem is going to come later when some of these plates get into the market or crooks try to distress them and claim they are genuine. From a photo during a sale or trade it will be very difficult to tell if the plate or plates are genuine or not.
This just makes everything difficult for everyone. Reproductions are very bad for the hobby and if you care about the future of the hobby, it is better you do not buy reproductions.