44 Magnum with an original nickel finish, shipped in November 1956. 44 Magnum with an original nickel finish and Class A-engraving by Virginia Le Blanc, shipped in October 1956. 44 Magnum with a 4-screw frame and factory nickel finish, shipped in July 1957. Click on the photos for a better look.
Bill
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It should have an S prefix serial number higher than about S877xxx. If you post the full serial number, I can give you a pretty close estimate of its ship date. I'd also like to enter it in my research notes on the S prefix M&P revolvers.I've got an old M&P similar to the OP's . . . I think it was made around '46 or '47.
I will send it to you in a PM.