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This is a Roman bust excavated at the French city of Arles (see also French Wikipedia on Arelate). Currently, it's part of the collection of the Musée de l'Arles antique (previously Musée Lapidaire). Initially, it was assumed that it's a bust of the Roman emperor Augustus (Octavian). You can still find online sources describing the bust as one of Octavian. Nowadays, the bust is labeled as showing Gaius Caesar, grandson (and adoptive son) of Augustus.
A modern photo of the bust:
Source: Wikimedia Commons, Photo by Carole Raddato from FRANKFURT, Germany / CC BY-SA
More photos (also from other busts showing Gaius Caesar) at Wikimedia Commons' Category devoted to busts of Gaius Caesar.
Another photo of the bust with some additional details is available at Flickr (i refrained from embedding it due to "all rights reserved").