Aureolus, 267-268 AD, rebel in Milan, struck in the name
of Postumus. AE Antoninianus 19mm, 3.78 g. Milan mint. 

IMP POSTVM.., radiate, draped, cuirassed bust right.
VIRTVS EQVIT, Virtus advancing right, holding spear and shield; 
T in exergue. 

RIC V 388; Mairat 224-5; AGK 111b; RSC 441. 

Coins of Aureolus can be distinguished from others of Postumus by having mint letters in the exergue. 
A much superior example to most with good flan and portrait. Scarce.