During World War II in the freezing Netherlands winter of 1944/1945 the western Netherlands are in the grip of a famine. Many people move east to provide for their families. Fourteen year old Michiel can't wait to join the Dutch resistance, to the dismay of his father, who, as mayor, works to prevent escalations in the village.
It's a BMW R12 750cc sidevalve twin, built between 1935 and 1942 no Sir, sorry, looks like but is not! it's more an actual Chinese or Russian combination
There a different bikes on these pictures (look at the sign on the front of the sidecar). The main picture and the third on imageshack to me appears to have a pressed steel frame (best visible on the last picture), so that would be a R12. The other bike has a tubular frame and a swingarm and looks more as a R71 or the Russian Ural M72 (or Chinese Chang-Jiang 750, which is copied from the Ural)