This one is a puzzle for me. The weight of 18.5 grams corresponds to the tetradrachms from Athens with an individual weight of an unusual 4.5 grams. Seven of the ten known coins were found in the Egyptian "Asyut" hoard, but all were minted at Delphi, in northwestern Greece at the home of the famous oracle of Apollo. On the coin are two rams heads placed side by side, facing down.