Decentius, AE29, Trier, 353 AD. 7,72g.

D N DECENTIVS FORT CAES, bare-headed, draped, cuirassed bust right.
SALVS DD NN AVG ET CAES, Large chi-rho between A and W.
Mintmark TRS. 

RIC VIII Trier 319; Cohen 13; Bastien, Magnence, 85. 

Scarce.

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

Note: When identifying these chi-rho coins, the diameter
of the coin plays an important role.
27-29 mm: RIC VIII Trier 319, scarce
23-25 mm: RIC VIII Trier 322, scarce
20-21 mm: RIC VIII Trier 326, rare.