Watch List notes:

THE ROMAN EMPIRE
Gallienus, 253 – 268

Antoninianus, Mediolanum circa 259, billon 2.97 g. GALLIENVS AVG Radiate and draped bust l., holding club over r. shoulder. Rev. P M TR – P Emperor in prancing quadriga l., crowned by Victory; in exergue, [VII C]OS. C –. RIC –. Göbl –, cf. 1234 for reverse.
An apparently unrecorded variety and a very interesting and fascinating bust.
Weakly struck on reverse, otherwise extremely fine