I've bought this 4x5 camera more than two years ago and despite my best attempts, I was never able to identify it. It does look a lot like an old Korona form the 1920-1930's, except that the front standard does not move along the rail (not front focus - it features all the other four movements, however). Here are some pictures that will hopefully help you.
For those of you who wonder, the lens is a german Laack Anastigmat Pololyt 135/4.5, quite an oddity by itself, with very little info on the net.
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