Æ21 - Valerian and Gallienus ΑΜΙϹΟΥ ΕΛΕ (ΘΕΡ)

Amisus, the old Greek colony on the Black Sea coast, retained unusual civic minting privileges well into the imperial period — a function of its longstanding status as a free city, a designation it had held since Pompey reorganized the region in the 60s BC. The joint reign of Valerian and Gallienus lasted only until Valerian's capture by Shapur I at the Battle of Edessa in 260, which gives this issue a hard terminus that is historically precise rather than estimated.

The ΑΜΙϹΟΥ legend places this firmly within the civic series rather than the provincial imperial mint output, a distinction that matters for attribution.