The following information has been sent to me as it adds to the discussion, even if it is 4.5 years later.
There are two different models of the Victoria Spatz. This is described at "
https://en.wikipedia.org/wiki/Spatz_(automobile)".
The number of produced cars is slightly higher then the numbers given at wikipedia, as this are the production numbers from Victoria (Nuremberg) only.
Victoria sold the remaining car parts to the plane factory Burgfalke which then assembled an unknon number of further cars "
https://www.mittelbayerische.de/region/schwandorf-nachrichten/spatz-wird-zum-burgfalken-21416-art868343.html".
The highest serial number known to me is in the range of 1720.
The number of Victoria Spatz produced was so small that many parts are same as in other cars of that time. Over the years Victoria installed brake cylinders of varying sizes (14, 15, 19mm). Some are identical to VW Kaefer, some identical to the ones used in Porsche 356. The main brake cylinder is same size as in the LLoyd Alexander. Most of the electrical switches and the instrument cluster are identical with the ones used in the Heinkel Kabin. The motor of the first model with 200 cmm is very similar to the motor used in the Messerschmitt Kabinenroller. The motor of the 250 ccm model and the electrically operated gear box is unique from Victoria.
There are a number of Victoria Spatz on public display, for example at the Deutsches Museum at Munich or at the Städtisches Museum at Nuremberg. In 2020 a Victoria Spatz 250 got auctioned at Vienna
(Austria) and another was offered at Ebay in 2019. There was also a valid offer and one fraudulent offer on Ebay in 2020.
Chris Thomas