This strange artifact is in the British Museum and is listed as a Minoan Amphorae made about 1600 BC. But the Mythos investigator in me see's a stylised image of Cthulhu in his house at R'lyah! Note the strangely 'aboriginal' style of artwork ... clearly this isn't Mediterranean but instead hails from the southern Pacific near the sunken city itself!!!
Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtan!!!
Ahem. Sorry. Must have failed my sanity check dice roll.