There were a zillion variations, but an almost identical one is shown the the ALFA catalog of 1911, at 18 German marks, which was about $4.50 at the time, so you paid too much. Today's value basically is what a buyer can get. There is a mild collector/novelty interest, and one in like new condition can bring $200 or more; most bring half that. That gun is missing the ejector rod.
The .320 was the equivalent of the obsolete .32 Colt, so .32 S&W cartridges might not fit.
Most of those guns have no maker's marking since they were put out by Liege consortiums, groups of small workshops in which one company made cylinders, another barrels, etc. Those made by a single factory are uncommon. Some people call any small European revolver of that general period a "Velo Dog", but that term really applies only to revolvers chambered for the Velo Dog round, a long .22 caliber center fire.