Æ20 - Gordian III ΚΑΛΧΑΔΟΝΙΩΝ

Chalcedon's civic bronze coinage under Gordian III belongs to a municipal minting tradition that was already under pressure from the broader Roman trend toward centralizing currency production. The city, positioned at the mouth of the Bosphorus opposite Byzantium, had leveraged that geography into commercial weight for centuries — but by the mid-third century, civic bronzes from Bithynian cities were increasingly redundant as Roman imperial coinage penetrated local markets more deeply.

The reference VII.2#1861 places this within the Sylloge Nummorum Graecorum framework for the region. Chalcedon's issues for Gordian are not common finds.