Æ22 - Gallienus ΙΕΡΑϹ ΝΕΙΚΟΠΟΛΙϹ, Δ

Nicopolis ad Isthmon was a minor Achaean civic mint that produced bronze for strictly local use during the reign of Gallienus — a period when the Roman empire was fracturing under simultaneous pressure from Postumus in the west, Odaenathus in the east, and near-continuous barbarian incursion across the Danube. The Δ in the exergue is a denomination mark, part of a municipal tariffing system whose precise conversion ratios remain disputed among specialists.