Welcome to the Forum.
That serial number dates to 1953 for a large frame or about 1946 for a medium frame, according to the Standard Catalog of Smith and Wesson.
A half moon front sight means it is ether a .38/44 Heavy Duty or a Military and Police revolver. The Heavy Duty is the large frame, the M&P is the medium frame. The Heavy Duty will have an under barrel shroud around the ejector rod. Does this have one?
Pics would help if you can post some.
Jim
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