Here is what they have posted over at RimFireCentral.com
"Here is a Summary of S&W M41 Dates of Manufacture from this Thread:
Serial #___ Date of Mfg.
104XX_______ 1958
149XX_______ 1959
189XX_______ 1959
295XX_______ 1960
1120XX______ 1969
114XXX____ ~ 1969
"A" Prefix_____ 1970 with A115001
A145801_____ 1972
A225XXX_____ 1973
A235001_____ 1974
A265001_____ 1975
A295001_____ 1976
A414XXX_____ 1977"
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