Antoninus Pius, AE Sestertius, struck AD 139. 34 mm, 27.76 g. 

ANTONINVS AVG PIVS PP, laureate head right. 
PARTHIA, Parthia, wearing short chiton and cloak hanging behind, standing left, holding crown, bow and quiver with arrows. S-C across fields, COS III below.

RIC III 586; BMCRE 1191; Cohen 572.

With permission of cngcoins.com, auction 133, Lot 237, Feb 2006

RIC_0586