Decentius AE "Centenionalis" 5.89 gr, 23.21mm. Trier. 350-353 AD.  

Obv: DN DECENTI-VS FORT CAES, bare-headed, draped and cuirassed bust right.
Rev: SALVS DD NN AVG ET CAES, around large Chi-Rho flanked by A and 
W. 
Mintmark TRS dot.  

RIC VIII Trier 324; Sear 4033.

Courtesy of TimeLine Originals (www.time-lines.co.uk), March. 2010