Tetricus II AE Antoninianus.  Trier or Cologne mint.

...TETRICVS CAES, radiate, draped bust right.
PAX AVG, Pax running left, holding branch and sceptre.

RIC 251; Cohen 38. 

Note: RIC cites Cohen, who gives no source for his entry. The image shown is only the reverse type which Cohen and RIC refers to. Despite an intensive search, I was unable to find an example of the Cohen coin.