"Attica, Athens. Time of Valerian I to Gallienus. A.D. 253-268. AE 20 (20.2 mm, 3.70 g, 1 h). Draped bust of Athena right, wearing Corinthian helmet / ΑΘΗΝΑΙΩΝ, Athena standing left, holding patera, round shield, and vertical spear; at feet left, lighted altar; behind, serpent coiled left. Kroll 337; Svoronos, Athenes pl. 87.8, 11. EF. Very Rare. "