Antoninus Pius with Marcus Aurelius as Caesar. AE Sestertius, 32mm; 21.78g. AD 139. 

ANTONINVS AVG PIVS PP, laureate head right. 
AVRELIVS CAES AVG P II COS DES, Bare-headed, draped bust of 
Marcus Aurelius left. SC in ex.

RIC 1206; BMCRE 1205; Cohen 7.

With permission of cngcoin.com, the AK Collection.