Marcus Aurelius as Caesar, AE28 of Cius, Bithynia. AD 161-180.

M AYRHL ANTWNINOC KAICAR, bare-headed, draped, cuirassed bust right.
KIANWN, Zeus standing left, holding patera and sceptre.

Prowe (2013) 14 corr. ("Elagabalus", this coin)

Image copied from Prowe's article in Numizmaticeskij Sbornik 3 (1913). 
This is more likely Marcus Aurelius than Elagabalus, because of the "KAICAR" part of the legend.