The quantity of silver controlled by the Athenians allowed them to mint the authoritative coinage of ancient Greece, the thick and heavy Athenian “owl” tetradrachm, which remains the most recognizable ancient coin today. This coin was the largest silver coin of its time, and it popularized the use of a coin’s obverse as the “head” and the reverse as the animal’s “tail”.They were produced for over four hundred years, and while the artistic style changed over time, the theme remained consistent, showing Athena, the goddess of wisdom and warfare, on the obverse and an owl, her patron animal, on the reverse. This consistency reinforced their international message and came to symbolize Athens’ economic power.
Ancient Coins: The Most Famous Coin of Antiquity - CoinWeek : CoinWeek