The present head is a reversed copy of an early Hellenistic type known from numerous other Roman copies (for example a head in Dresden: K. Knoll, et al., eds., Staatliche Kunstsammlungen Dresden. Katalog der antiken Bildwerke, vol. 2, 2011, pp. 898ff., no. 213). Also see Sotheby's, New York, December 12th-13th, 1991, no. 77, and December 17th, 1997, no. 114, and Sotheby's, London, Ancient Marbles, June 13th, 2016, no. 38.