Based on the serial number, I would guess shipment happened in about 1924-25. Muley Gil's brackets are good: Made in U.S.A. added in mid-year 1922, mushroom extractor rod knob went away in about 1927. One in my collection at 5315xx left the factory in February, 1926.
The stocks on your M&P are later than the gun. That style started shipping in about 1953.
Also, I don't think N stamps were used that early. With a B on the barrel flat, it would have had a blue finish. If it got the nickel finish there were be no mark on the barrel flat ahead of the serial number. In other words, the absence of the B means nickel. N stamps on the rear face of the cylinder and on the left side of the grip frame came later.
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Jack
SWCA #2475, SWHF #318
Last edited by JP@AK; 04-29-2017 at 01:21 PM.
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