Vintage BMW Motorcycle

One cold January afternoon in the Navigli area of Milan, we came across this well-preserved WWII BMW R75 motorcycle with its original sidecar.  We arrived just in time to meet the owner and his wife: a charming couple obsessed with all things from the WWII era.  The brave couple had just ridden the Bimmer from outside Milan in the freezing cold to visit the city for the afternoon.  They also own a Zundapp from the same era.  

Interesting trivia: during the war, the Nazi state required  BMW and Zundapp to cooperate and standardize on a common set of parts in order to ensure availability of parts for all motorcycles in service.

What do you think is the most interesting WWII-era vehicle?