Antoninus Pius. AE Dupondius, 24mm, 11.95 g. Rome mint. Struck AD 155-156. 

ANTONINVS AVG PIVS P P IMP II, radiate head right.
TR POT XIX COS IIII S C in four lines within laurel wreath. 

RIC 951-953 var (reverse type). Not in RIC, BMC, Sear
or Cohen as a dupondius.

Extremely rare. 

With permission of cngcoins.com, April 2016
Estimate: $150.