Decentius, AR siliqua, 20mm, 3,30g. 351-352 AD, Trier, as Caesar under Magnentius. 

D N DECENTIVS FORT CAES, bare-headed, draped, cuirassed bust right.
VIRTVS EXERCITVS, Virtus in military dress, standing facing,
head right, left breast bare, holding spear and resting hand
on shield. 
Mintmark TR.

RIC VIII Trier 305; RSC 49. Bastien, Magnence, 55. 

Very rare.

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