I inherited a 6 inch model 28 with a few scratches here and there. But a super clean bore. I know it was wrapped up in a oily cloth for the last 30 years. The original grips are long gone and it had some fake bone grips that were cracked. So now I have a modern set of the magnum size grips in there as a stop-gap measure.
I believe it dates to 1963 or 1964. It is an S prefix with the screw in front of the trigger guard. S2166xx
Problem is I already have a couple other 357 mags that I do not shoot , so I can't see a reason the have three.
About what type of value are these holding? I only found one for sale on Guns America.