Æ19 - Philip I ΚΩΙΩΝ

Philip I's reign coincided with Rome's millennial celebrations of 248 AD, and provincial mints across the eastern empire — including the small island polis of Cos — struck bronze issues to mark both the emperor and the occasion. Cos, operating under the Conventus of Halicarnassus, maintained its own civic coinage well into the third century despite the broader contraction of provincial bronze production under Philip's predecessors.

The ΚΩΙΩΝ ethnic places this firmly within the island's autonomous civic tradition rather than as a colonial or koinon issue.