Constantine, AE Follis, Rome. 303-337 AD.

obv: IMP CONSTANTINVS P F AVG, laureate, draped and cuirassed bust right.
rev: SOLI INV-I-CTO COMITI, Sol standing left, chlamys 
across left shoulder, holding globe and raising right hand.
R-F across fields.
Mintmark R star S.

RIC VII Rome 19.

Courtesy of Forvm Ancient Coins online store, item 12026.