Domitian as Caesar, AE Dupondius or As. AD 80-81. 

CAES DIVI AVG VESP F DOMITIAN COS VII, laureate head left.
S-C across fields, Minerva standing left, holding thunderbolt and spear, shield at her side.

RIC II 315 (titus)
Rare (R2)

AAH Sale 1999.