You should be able to tell the difference between a factory job and gunsmith work. AFAIK, no such gun was made by the factory.
Years ago, several gunsmiths would convert just about any gun from anything to anything (within reason) and a favorite was converting revolvers made for obsolete cartridges to .22 LR.
While some kind of special order cannot be ruled out, I would want to see solid documentation on any such gun claimed to be from the factory.
Jim
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