Æ27 - Gallienus sole reign) (C I H R / CO (?)

Parium, a Hellenistic foundation on the southern Marmara coast, retained active bronze production well into the third century through the conventus system — Roman judicial circuits that inadvertently sustained local mint activity by concentrating administrative and commercial traffic. During Gallienus's sole reign, following the capture of his father Valerian by Shapur I in 260, the western provinces fractured under the Gallic Empire while cities like Parium continued striking civic bronze largely independent of the dynastic chaos unfolding elsewhere. The reverse abbreviation CO remains partially resolved at best.