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Aureolus, billon antoninianus, AD 267-268 AD, 3.93g). Milan. 
Struck in the name of Postumus.

IMP POSTV[MVS AV]G, radiate and draped bust right.
CONCORD [EQVIT], Fortuna standing left, holding patera and 
rudder.
Officina letter S in exergue. 

RIC (Postumus) 371; Cohen 18. 

Aureolus, a general of Gallienus, allied himself with 
Postumus and struck antoniniani in Milan, a city which 
Postumus had not conquered. His coins often have compact
die engraving, reverses noting Calvary, and are on flans 
thicker and shorter than those of Postumus' Gallic mints. Aureolus was executed under Claudius II.