Wischo was the Trade Name of a German firearms dealer by the name of Wilsker & Co. They were located in Erlangen Germany. The .25 automatic your inquiring about was probably made by one of the many German handgun makers who were in business in the 60's & 70's. Impossible to determine without detailed information, but values on these are generally not very high, in the range of $50-$100, depending on condition.
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