Caracalla, AE27 of Gangra (Germanicopolis), Paphlagonia, AD 198-217. 

AYT K M AYR ANTWNINOC, laureate, cuirassed bust right.
ARX PAF GANGRWN, two tall buildings with two smaller buildings between them. 

St. Florian 1; RecGen 60-61 type. 
Extremely rare.

With permission of cngcoins.com, auction 291, Lot 202, Nov 2012