how can a seller mis-identify a pistol with a model number stamped into it?
For a very limited time, there were some aftermarket stainless steel frames made by BII and AMT, but the shape of the trigger guard looked more like a 1911 than a S&W, and I don't think they were model stamped either.
I mention them as since they are rarer than an honest politician with hen's teeth, finding a M39 so equipted would be a real coup..