51-52. Call S&W and they will tell you when it left the factory
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There is no such weapon. The Model 18 was chambered in 22 LR.
DO NOT ATTEMPT TO DO THIS!!!!!
Made in 1975.
@1961
Need a sn to date it.
@1992
1976
You will have to call S&W
1970
1960
75-400 or so