Call me a liar if you wish. The gun was featured on the cover and in an article in the June (I believe) 1954 issue of The American Rifleman). The Colt barrel had been milled flat in the area of the extractor rod, and a front lock had been dovetailed in place.
As to model number, this was prior to the practice of identifying S&W revovlers by model number. And 22/32 target revovlers wers not so scarce at that time.
As to J-Frames, these were considered suited to the ladies, who found the K-38 too large for their hands, and too heavy.
Improbable? If you say so.