Certainly looks European to me, probably Belgium but could be Spanish.
In The Illustrated Encyclopedia of Handguns; by A.B. Zhuk; © 1995; page 51 #286: Saint George; William Grah; Liege. Similar to the Pieper and Clement revolvers. The illustration is very much like your photo but not exact. Overall outline the same as is trigger guard and grip frame.
Nope I'm wrong; page 49 #278: Perfectionne; Henri Pieper & Companie. This illustration looks a lot like your photo but with what appears to be a safety on the side; 8mm
The book has drawing of just about every handgun made, although probably a bit dated now.