Æ28 - Gordian III C R I F S AN CCCXI

Sinope's civic bronze coinage under Gordian III was dated by the city's own colonial era, reckoning from its refoundation as a Roman colony under Julius Caesar in 47 BC — making year 311 (CCCXI) of that reckoning fall in 241–242 AD. The city had been one of the most strategically valuable ports on the Black Sea since antiquity, and its colonial status gave local magistrates unusual latitude to strike civic bronze independently of the imperial mint system.