Dropped off a RIA 10mm at my gunshop 2 days to ship to it's new owner and found this in the case. They had it marked as a 15, But when I opened the crane to inspect there was no model # and then I flipped it over and saw and that extra screw on the other side! No box and obviously the grips are not original though in nice shape, as is the gun, only one real spot of bluing loss on the cylinder and the very edge of the Barrel

I've wanted one of these for a while. Serial K169220 Dates it as 1952 production. I Gave it a little cleaning yesterday, had to pull the cylinder off the yoke as it wasn't spinning nicely and cleaned some gun out of it, now its ready for a trip to the range!