Watch List notes:

EGYPT, Alexandria. Valerian II. Caesar, AD 256-258. Potin Tetradrachm (22mm, 11.15 g, 11h). Dated RY 5 of Valerian I and Gallienus (AD 257/8). Π ΛIK KOP OVAΛεPIANOC KAIC CεB, bareheaded, draped, and cuirassed bust right / Draped bust of Serapis left, wearing ornate calathus; L Є (date) across upper field, scepter behind. Köln 2999; Dattari (Savio) 5365 (Saloninus); K&G 92.11; Emmett 3769.5 (R3). Good VF, dark brown patina. Very rare.

Ex Classical Numismatic Auctions XXI (26 June 1992), lot 539.