Image rights: wildwinds.com

Postumus. 259-268 AD. Æ Double Sestertius (12.62 gm). Struck 261 AD. IMP C M CASS LAT
  POSTVMVS P F AVG, radiate, draped and cuirassed bust right / FIDES MI-L[ITVM], Fides
  standing left, holding two ensigns. RIC V pt. 2, 123; Bastien 77; Cohen 74. 

online sale, April 2000.