In Austria, owners of multiple cars are allowed to register multiple cars under one registration number. This may result in frequent re-registering and consequently the same car appearing with different licence plates at different times. This makes cataloguing the cars of which I take pictures not exactly easier.
This is a 1936 25/30, first in Steyr in 2009, then in Meggenhofen in 2015:
The owner is a collector who has several Rolls-Royces, this being the oldest.