 In 2001 Destrooper-Georgiades, a specialist in Achaemenid numismatics, said that investigations of 33 tombs had yielded 77 coins.Although denomination varies, as does the number in any given burial, small coins predominate.Coins started to be placed in tombs almost as soon as they came into circulation on the island in the 6th century, and some predate both the first issue of the obol and any literary reference to Charon’s fee.