Macrinus, AE29 of Ephesos, Ionia. 15.22 g. AD 217-218. 

AYT K M OPE CEO MAKREINOC, laureate, cuirassed bust right, 
slight drapery on left shoulder.
PRWTWN ACIAC EFECIWN, Artemis riding side-saddle on 
horseback right. 

SNG Leypold 596; BMC 295. 
Very rare. 

With permission of cngcoins.com, Triton XIII, Jan. 2010.
Estimate: $750.