That depends. If that sculpture survived decades or centuries and then put on display in a museum far removed from the ability to recreate that sculpture from t

That depends. If that sculpture survived decades or centuries and then put on display in a museum far removed from the ability to recreate that sculpture from the original molds, then in a way, yes, it is an original. However, if the molds are still available and another can be cast and finished, then no. Still a specific instance of an unoriginal item might be special. It could have been painted post-casting by someone famous, or survived a war or shipwreck, and so forth. Originality is now no longer a distinguishing aspect of the sculpture's value.