diggs, it looks like the pistol you're describing is a Fegyver es Gepgyar (FEG) Model 1937. The Model 1937 was designed by Rudolf Frommer and made by FEG in Budapest, Hungary. The 9mm version is actually chambered in .380 ACP. Numrich Gun Parts Corp. lists a magazine for the Model 1937 at the link below.
Hope this helps!