Egypt. Alexandria. Gallienus, 253-268. Tetradrachm (Billon, 23.4 mm, 9.17 g). Dated RY 6 (= 258/9). Α Κ Π ΛΙ ΟΥ ΓΑΛΛΙΑΝΟϹ Ε[ΥϹ] Laureate, draped, and cuirassed bust right. Rev. Draped bust of Serapis left, wearing ornate calathus; L ς (date) across field, vertical scepter behind. Geissen –. Dattari-Savio 5210. Emmett 3740. Kellner p. 133, pl. 15, Abb. 3. Cf. SAVIO A., Tetradrammi alessandrini, pp. 153-157. Dark brown patina. Good Very Fine. Ex Busso Peus 294, 15.03.1978, lot 743. We enter the reign of Gallienus, here still in co-regency with his father Valerian, with a tetradrachm of superb preservation, with a mannered imperial portrait on the obverse, while on the reverse dominates a heroic bust of Zeus Serapis with a huge kalathos and a long sceptre terminating in a lotus-blossom shape.