Postumus Billon Quinarius, struck AD 261 at Cologne mint.
Obv: IMP C POSTVMVS P F AVG, laureate, draped and cuirassed bust right.
Rev: FIDES MILITVM, Fides standing left, holding two standards.
1,74 g, 17 mm.
Schulte Q3, Elmer 192, de Witte -, RIC -, Sondermann Q1 - Q3 (3 specimens)
Very rare, only 3 specimens listed by Schulte, 3 additional specimens in S.Sondermann, Neue Aurei, Quinare und Abschläge der gallischen Kaiser von Postumus bis Tetricus.