Mfg date S&W 46 S#73xxx ?

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Anyone have an approximate manufacturing date for a S&W Model 46 Ser. No. 73xxx?
Thanks in advance.
Tony

 

[FirebirdV8]

From my research, it should be around 1965/1966

 

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Thanks,
Yesterday I purchased a S&W 46 with a 5 1/2 inch bull barrel. It is engraved on the side with the indication that it was presented as a prize to the Indiana State Police pistol champs in 1965.