Are you sure that there isn't a number in front of the K? Model 66's weren't produced until 1970 and by that time S&W serial numbers started at K946392-K999999, 1K1-1K3950, 2K1-2K222037. A 66 with a blackened rear sight would probably have a serial number starting with at least a 1 or more probably 2K+.
A stainless looking K frame serial number K751xxx would make it a nickel plated model 19-2 produced in 1967.
A stainless looking K frame serial number K751xxx would make it a nickel plated model 19-2 produced in 1967.

bought it sight unseen and well, not as nice as I had hoped. May need to replace it so I can have the trio all in comparable good condition.
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