Well, in due deference to the Antiques Roadshow folks, there's silver---and then there's silver plate. You can polish "sterling silver" until the cows come home. Silver plate, on the other hand, is/can be eventually worn off---including worn off by polishing.
Some silver plated items (perhaps all of them----when they were new) are/were lacquered---to keep the air off and the shine bright. IF---if that was the case on S&W's revolvers----and IF ALL the plating is still there (along with all, or damn near all of the other finish----except for the original lacquer), then I, personally, would have no problem with a mini-restoration which included polishing the silver----and applying a new coat of lacquer so you won't have to do it again. Otherwise, I, again personally, would be inclined to let it be.
Bottom Line: There are different strokes for different folks.
Ralph Tremaine