Tetartemorion

Orchomenos was one of Boeotia's oldest and most powerful cities — rivaling Thebes in regional influence during the archaic period — yet its coinage at this fractional level is extraordinarily rare, surviving in numbers that suggest extremely limited production runs. The tetartemorion, a quarter-obol, circulated as one of the smallest denominational units in the Greek world, suitable for single-transaction retail exchange in local markets.

BCD Boiotia 200 represents a type documented almost entirely through the collection that gave the reference series its name.