Severus II, AE follis 27mm, Ticinum, 306 AD. 

SEVERVS NOB CAESAR, laureate head right.
VIRTVS AVGG ET CAESS NN, Mars walking right, holding spear
and trophy.
Mintmark ST. 

RIC 60a; Cohen 70.

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