These are made in molds and not exactly a sculpture, although it could be a copy of a sculpture !! How do you know it is that old ?? Plaster plaques similar to this were made throughout the 20th century as wall decoration !! Mid century was heyday for plaster plaques !! My mother had a large plaster plaque of the Lords Supper over the dining table for many years !! She got it in the 50`s !!