Almost 20 years ago I found this at the flea market, beaten to pieces, in a garbage can:
I thought it was kind of a "backpacker mandolin". Having the parts sorted, I gave them to friend of mine luthier Karsten Schnoor (fine archtops and more: http://www.karstenschnoor.com/) to glue the wooden puzzle together. He suspected it to be built maybe by a prisoner of war with lutherie knowledge during or after WWII.
Here are some more pictures of this slighty deranged instrument:
I'm looking forward to some mandolin addict in this forum saying something about instruments like this one.