Constantine I AE follis of Rome. AD 317. 

IMP CONSTANTINVS P F AVG, laurate, draped and cuirassed bust right.
CLARITAS RE-PVBLICAE, Sol advancing left, chlamys flying
out behind, holding whip and raising right hand.

A in left field
Mintmark RQ.

RIC VII Rome 80.
Rated R3.

Contributed by Glenn Simonelli, June 2014