This Amphora belonged to William Henry Fox Talbot and was sold at Sotheby's Auction (Antiquities lot 30) on 5 June, 2013. The auction catalogue describes the object:
An Attic Black-Figured Amphora of Panathenaic Shape, Attributed to Close to the Princeton Group, Circa 540 B.C.
painted on one side with Athena Promachos between two columns each surmounted by an owl, and on the other side with a kithara player standing on a stepped podium between two seated draped youths, linked lotus buds and palmettes on the neck, the details in added red.
Image from the collections of the British Library (usage terms: Public Domain)