Gallienus, 253-268. Antoninianus (Billon, 22 mm, 2.42 g, 7 h), Rome, 260-261. GALLIENVS AVG Radiate head of Gallienus to right. Rev. ADVENTVS AVG / P Gallienus on horseback to left, raising his right hand in salute and holding scepter in his left. Cohen -. MIR 338a (2 examples). RIC -. Extremely rare and with a very interesting reverse. Light porosity and with a thin flan crack, otherwise, very fine.