Gallienus, 253-268. Antoninianus (Billon, 21 mm, 4.17 g, 6 h), Mediolanum, 260-261. GALLIENVS AVG Radiate and cuirassed bust of Gallienus to right. Rev. LEG XI CL VI P VI F Neptun standing front, head to right, holding trident in his right hand and dolphin in his left. Cohen 535. MIR 1014n. RIC 359. A perfectly centered example. Thin surface crack on the obverse and with minor deposits on the reverse, otherwise, very fine.