The Symes Pan

Last week Dr Christos Tsirogiannis identified the Medici Pan that is due to be auctioned in New York later this week. Tsirogiannis has now identified a terracotta Pan from the Schinousa archive that is due to be auctioned at Christie's Rockefeller Plaza (December 13, 2013, lot 114, estimate $8000 - $12000).

Christie's have offered the following collecting history:

• with Edward H. Merrin Gallery, New York, 1968. 
• Private Collection, New York, 1968-2011.

So when was the Pan in the possession of Robin Symes? What is the identity of the private collection? Is the collecting history presented by Christie's robust? What authenticated documentation was supplied to Christie's?

The Edward H. Merrin Gallery has been linked to the bronze Zeus returned to Italy, material in the collection of Dr Elie Borowski, as well as the marble Castor and Pollux on loan to New York's Metropolitan Museum of Art.