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The revolver on the bottom is a 1975 vintage Model 27 wearing it's original factory supplied grips
However mine does have the target hammer and target trigger and left the factory with a presentation case
I agree that yours would have left the factory with Magnas.
As to wood, that is around when Goncalo Alves was rolled in, but Smith and Wesson wastes nothing so the overlap from Walnut could have been a long time depending on inventory and sales. Either one might be right