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S&W Model 66-2.

MIL has a S&W .357 Stainless revolver w/4" bbl. Model says 66-2. I can find on the M-66. What does the -2 stand for.
Comments
W.D.
Whenever Smith made design or mechanical changes they put a dash and another number to signify the change. I think they are at about -9 or -10 on the model 66 revolvers.
Love those 66's
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I've had a 66-2 for twenty-five years. An excellent revolver.