Ancientcoinart.com Lot No.9157. Sold for $175 in 2006. 

Elagabalas or Caracalla .( Not only are the obverse inscriptions no use in distinquishing between Elagabalus and Caracalla (both had official names of Marcus Aurelius Antoninus), Elagabalus did his best to legitimize his reign by encouraging speculation that Caracalla was his father, so there is an intentional resemblance in the portrait styles. Æ 30mm of Serdica, Thrace. AVT K M AVPH ANTNEINOC, laureate & cuirassed bust right / OVC CC, The emperor on horse right, holding sword, and in left hand holding the bridles of the horse; on the ground is lying enemy..
Similar to Moushmov4870 but right, holding sword