Hey guys, wondering if anybody can tell me about a nice ruby pistol I picked up, I don't have much to go off right now.

Slide says Gabilondos Y Urresti-Elgoibar-Ruby Cal765
Serial 1099xx with a F to the right of the serial number on the frame.
Left side of the gun behind the grip there is a G.U. encircled. I believe I red that was one of the military inspectors marks.
There is no rivet on the slide for a safety guard like most Frenchicon pistols had.

That is all I have to go on right now, should have gotten more pictures but was in a hurry that day, I'll post the pics I have if I can figure out how to do so from my phone.
Any help is appriciated.
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