The finds were made by a dig headed by Hourig Sourzian of the Friends of the Memnon Colossi association that is affiliated with the Egypt office of the German Archaeological Institute. The Sakhmet statues, which date to the New Kingdom's 18th dynasty (circa 1533-1292 B.C.), hail from the same period as most of the finds in the area. The head believed to date to the 25th dynasty (circa 760-656 B.C.) that is characterized by its Nubian features seems however out of place. In a statement by the SCA, Sourzian suggested that the head might have ended up at the location having been left there by a 19th century British dig or an illegal excavation by antiquities merchants."
http://tinyurl.com/7k8pv (Mail and Guardian)
"The head of excavations in western Luxor, Ali al-Asfhar, said he believes the royal head to be the most important discovery among the three items because of the questions raised by the presence of the head at such a location. Statues of Sakhmet are relatively common, having been found at many sites, he added."