Diademed head of Zeus right / Eagle standing left on thunderbolt, head reverted, monogram in left field; ΔIAΣ in exergue. 19mm, 8.23 grams. Dia mint in Bythinia. SNG vA 6930.

Imhoof-Blumer, in Griechische Münzen, stated that coins attributed to Dia, Bithynia are misread or misinterpreted, that Dia, Bithynia struck no coins and that coins with the legend ΔIAΣ should be attributed to Kabeira, Thrace - which was once called Diospolis. However, all other old and modern authors and catalogers of Bithynian coins (Waddington, Hoover, Mionnet, Babelon, Dalaison etc) do not agree, especially with regard as to where such coins are found.

Mithridates or Mithradates VI Eupator was the ruler of the Kingdom of Pontus in northern Anatolia from 120 to 63 BC, and one of the Roman Republic's most famous and determined opponents, prosecuting a number of bloody Mithridatic wars against the Roman Empire.