I agree with Carlton.
I would say that if you are interested in "preserving value", then I would leave it alone. By not doing anything to it, you cannot lessen the current value. But, by trying to restore it, you could potentiallly ruin the finish, engraving, etc. and devalue the pieces.
If you are not worried about "value" (which must be a concern since you mentioned it), then restoring it to a finish that you are happy with is the way to go.
It sounds like you want an outcome that will straddle both of the above criteria and I don't think there is a simple answer for that.
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