Caracalla, AE30 of Serdica, 14.8g.

Obv: AVT K M AVP CEV ANTWNEINOC, laureate, cuirassed bust right, seen from behind.
Rev: OVLPIAC C-ERDIKHC, Emperor, bare-headed, cuirassed 
and wearing boots, standing left, holding patera in right 
hand, transverse sceptre in left arm, left hand at hip, 
lit altar to left. 

Sofia 2700; Hristova & Jekov, Serdica, 12.18.34.18; Ruzicka 336.
Very rare, perhaps only the second known.
 
Contributed by marandnumiz of the Forum Ancient Coins, Jun, 2012