Last night I was searching for images of an unusual Volvo that I intend to post soon (one that hasn't been posted here before) and came across a Swedish Volvo blog that this puzzle car is featured in.
Quite why it was posted on that site is a mystery as there doesn't appear to be any Volvo connection except that they are both Swedish.
Anyway this three-wheeler is apparently an NV (Nymans Verkstader) of Uppsala built in 1942 with a Villiers 200cc engine.
My Swedish is virtually non-existant but I understand that the car in question appears to have been rebuilt in 1948 and last registered for the road in 1968.