Tetradrachm

Thasos built its monetary weight on Thracian silver — the island controlled rich mines on the adjacent mainland coast, and these tetradrachms circulated widely as a trusted trade currency across the northern Aegean. The type was struck over a long span precisely because it worked: merchants from Macedon to the Black Sea accepted it without question, which is why so many surface in hoards far outside Thasian territory.

The archaic style deliberately persisted long after Thasos was capable of updating it — conservative die-cutting was a commercial choice, not an artistic one.