Antoninus Pius AE dupondius, 25-26mm; 11.68g. 

ANTONINVS AVG PIVS P P IMP II, radiate head right.
TR POT XXI COS IIII, S-C across fields, Annona, draped, 
standing right, holding rudder on globe and resting a 
modius with corn-ears on left knee, left foot on 
prow. 

BMCRE 2044 footnote; RIC 980 var (listed only as a 
sestertius).
Very rare.

With permission of cngcoin.com, the AK Collection.