Buying absentee based on poor photos and description is always an adventure. I found a 5" M&P, s/n 684xxx, represented as caliber .38 S&W. So far, it seemed to be an early British Service Revolver with commercial stocks. The hammer, however, gave hints of being interesting.
When the gun arrived, it was caliber .38 S&W SPECIAL. All matching, including the stocks. I cannot imagine anyone ordering a humpback M&P. That leaves the fitter grabbing the wrong hammer or a later replacement. I suspect the latter, as the hammer may have been blued at one time. Is this a factory humpback?
Bob

When the gun arrived, it was caliber .38 S&W SPECIAL. All matching, including the stocks. I cannot imagine anyone ordering a humpback M&P. That leaves the fitter grabbing the wrong hammer or a later replacement. I suspect the latter, as the hammer may have been blued at one time. Is this a factory humpback?

Bob