New to the forum. Couldn't resist putting my 2 cents worth in. 6" Nickel 27-2 is from 1980. 5" 27-2 is an "S" serial number from 1964, and the 4" 28-2 is from 1979.
What model is it?
My current 27 is a '72 27-2 3.5" blue that I've personalized with a .312" smooth combat CC trigger (for some reason, the .500 grooved target just seemed too big for a "shorty")
I agree with everything SaxonPig said and to me they are the best looking S&W revolver in the line up. I also think the 5 inch is the best balanced and I like shooting my 3.5 inch at the range. I have a 4 inch in nickel finish and it's really pretty and the crown jewel in my collection is a 5 inch only fired at the factory with a nickel finish.
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The "S" prefix was before the Gun Control Act of 1968 when they became N prefix. The "S" is more desirable for that, and other reasons.
Here's a detail of the checkering.
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Always wondered why S&W didn't checker the rest of their premium N-frame guns.
Or the K-22/32/38 Masterpieces for that matter.