Constantine, AV Four aurei medallion. Rome mint. 306-307 AD.

CONSTANTINVS NOB CAESAR, bare head right.
PRICIPI IVVENTVTI, Constantine I standing left, holding
sceptre and raising right hand, standard to left. 

Mintmark PR.

RIC VI 142 var (bust type).

With kind permission of Numismatica Ars Classica, 2009.