I agree with most of the input so far. He is one more opinion.

To my eye the finish on the S&W revolver stocks from the late 1960's through the 1990's was glossier than the finish on the stocks from the early 1960's and older.

I find the Birchwood Casey Tru Oil Gun Stock Finish is best at reproducing the finish of the newer (glossier) gun stocks (i.e. late 1960's to 1990's).

I find Tung oil (I have used Minwax Tung Oil Finish) better reproduces the less glossy finish on the older gun stocks (i.e. early 1960's and older).

There are a couple of S&W Forum members, DWFAN being a stand out, who are excellent with stock refinishing. I do NOT recall having seen them give an opinion on this topic.

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Scoundrel & Ne'er-Do-Well