Constantine, AR Argenteus, 306-307, as Caesar under Galerius, 
Maximianus und Maxentius. 

CONSTANTINVS NOB C, laureate head right.
VIRTVS MILITVM, campgate with three turrets, arch open, no doors.
Mintmark RT.

RIC VI Rome 154. 

Contributed by Dr. Hubert Lanz, auction November 2000, 
Added July 2011.