Gallienus. AD 253-268. Brockage Antoninianus (20mm, 2.55 g, 12h). Mediolanum (Milan) mint. 6th-7th emission, AD 265-267. Radiate head right / Incuse of obverse. VF, thin die break in obverse field. Rare brockage.
According to MIR, this obverse legend and type combination was only used for the 6th and 7th emissions at Mediolanum. The style is also consistent with this period at that mint.