I just got this coin from Germany, it is not in great shape and doesn't look like much, but it has an interesting story.
This type was only struck at Trier and is attributed to the period known as the Revolt of Poemenius. This event would be completely lost to history except for the brief passage in Ammianus 15.6.4: “...Poemenius was condemned as a malefactor, hailed to execution and perished; he was the man (as we have told above) who was chosen to protect his fellow-citizens when Trier closed its gates against Decentius Caesarâ€.
Sometime in A.D. 353, the citizens of Trier revolted against Decentius and declared their support of Constantius II (SALVS AVG NOSTRI = Safety of our Augustus). Unfortunately for Poemenius, he was executed in A.D. 355, probably for his support of Silvanus.
Constantius II
Circa A.D. 353
22x23mm 7.0gm
DN CONSTANTIVS P F AVG; rosette diademed, draped and cuirassed bust right.
SALVS AVG NOSTRI; Chi-Rho flanked by A and W
In ex. TRP star
RIC VIII Trier 333