Image rights: wildwinds.com

Caracalla, AE 45mm medallion of Pergamum, Mysia. AD 198-217. 

AYTKRA K MARKOC AYR ANTWNEINOC, laureate, cuirassed bust right.
EPI CTR M KAIREL ATTALOY PERGAMHNWN PRWTWN G NEWKORWN, emperor on horseback riding right, looking back, a soldier 
walking behind him, statue of Asklepios on a base to right.

SNG Tuebingen 2488; Hunter 64; SNG von Aulock 1414 and 7514.