Circa 85-65 BCE
AE 19mm 7.58g
Obv: laureate head of Zeus to right.
Rev: ΔΙΑΣ, eagle, with spread wings and head turned back to right, standing left on a thunderbolt; to left, monogram.
SNG BM 1562; SNG Copenhagen 404
Dia was a port city in ancient Bithynia. Given that its coins are relatively common, the city must have been of decent size at one point. However, there is little written about it in history.