Antoninus Pius AE Sestertius, 31mm, 23.58 gr. 139 AD.
 
Obv: ANTONINVS AVG PIVS PP, laureate head right.
Rev: DACIA, S-C., D to lower left, COS II in exergue, Dacia standing left, holding crown and sickle. 

Cohen -; RIC -; Strack 786.
Other examples were in the Vatican and Leningrad Hermitage
collections in the 1930's
 
Contributed by Brian Healy, Feb. 2011.