BITHYNIA. Cius. Gallienus, 253-268. Tetrassarion (Bronze, 25 mm, 7.62 g, 7 h). ΠOY ΛI EΓ ΓAΛΛIHNOC CEB Radiate, draped and cuirassed bust of Gallienus to right. Rev. KIANΩN Serapis standing front, head to left, holding fillet in his right hand and scepter in his left; to left, lighted altar. RG 133. Rare and with a beautiful green patina. Very fine.