Definitely Belgian; the "star/F" is the initial of the individual inspector; the "ELG" in the oval is the Liege proof mark.
Liege turned out thousands of tons of guns of all types. Many were made by gun makers' cooperatives, with one company making, say, barrels, another cylinders, etc., so the guns have no makers' names. The caliber appears to be 10.6mm or 11mm, possibly for the German 10.6mm service cartridge.
Not too many were imported here, but those guns were sold all over Europe and the middle east. That gun was not officially used as a military revolver by any country, but could have been purchased by a soldier or officer. It would have been well obsolete by WWII, but the Germans hauled out some old Reichsrevolvers for reserves, so even that old clunker could have been carried by someone.
More likely, it was a civilian owned gun, siphoned up in the great gun confiscation/destruction by American troops in the invasion of Germany.
Jim