Although some shooters are attracted to nice animal carvings on gun stocks; there is no evidence that such work was ever done at the Smith gun works. I suspect what you have is what we refer to as "aftermarket" work; and I recall that such work was regularly advertised in hunting/sporting magazines in my youth (and is likely still being done by some today). However most colletors today consider this kind of aftermarket work, even though it may "snaze-up" an otherwise plain grained stock, a negative to overall gun value; and a purist would consider the stock "ruined".