Silver tetradrachm, 26 mm, 13.81 gm.
Obv: Diademed head of Ptolemy I right.
Rev: Eagle on thunderbolt.
Ptolemy I Soter was the first ruler of Egypt following its annexation by Alexander the Great, thus beginning the Ptolemaic dynasty that would continue for 300 years until the death of Cleopatra in 30 BC.
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