I noticed some time ago (December 2013) that there was a 'Palmyran limestone head' for sale on eBay. It was even used to illustrate two lectures in Cambridge.
The head has now been discounted at $3,900. Its collecting history has been given as "Provenance: Private NYC Collection, Ex Arte Primitivo." What are the dates? What documentation has been provided?
Note that the vendor is 'palmyraheritagemorriskhouligallery'.
The head also appears on the Palmyra Heritage website but at the undiscounted price.
The gallery is apparently run by Morris Khouli, For further information see here.