Constantine, AV Aureus, Siscia, 306-307 AD.

CONSTANTINVS NOB C, laureate head right.
PRINCIPI IVVENTVTIS, Constantine standing left, holding
sceptre and raising right hand, standard on each side. 

Mintmark SIS.
RIC VI Siscia 152

With kind permission of Numismatica Ars Classica, 2012