Decentius. AE25. 350-353 AD. Trier. 

DN DECENTI-VS FORT CAES, bare-headed, draped, cuirassed 
bust right

SALVS DD NN AVG ET CAES, large Chi-Rho, flanked by A and w. 

Mintmark TRS. 

RIC VIII Trier 322.

Courtesy of Roma Numismatics, Feb, 2010