Tetrachalkon - Mithridates VI

Amisos, a Black Sea port city with deep Greek roots, fell firmly within the Pontic kingdom's orbit under Mithridates VI, who transformed it into a royal mint city and granted it a degree of civic autonomy. These bronzes were struck during a turbulent stretch that encompassed the First, Second, and Third Mithridatic Wars — the protracted series of conflicts in which the Pontic king came closer than any eastern ruler since Hannibal to breaking Roman power in the Mediterranean world. Production likely continued until Pompey's final campaign forced Mithridates to flee to the Crimea, where he died in 63 BC attempting to raise yet another army.

Malloy 26f distinguishes this among several Amisene civic bronze types circulating concurrently under royal sanction.