I can't see a pinned barrel in the pictures and the grips are from a later production gun. i'd keep looking man.
Thanks! I have old eyes.If you enlarge the second picture the pin is clearly visible at the front of the top strap. Also, the back of the cylinder is snugged very close to the frame indicating recessed chambers. Non recessed has a larger gap between the cylinder and frame to make room for the cartridge rims.