Watch List notes:

Antoninus Pius (138-161). Egypt, Alexandria. Æ Drachm (31mm, 13.57g, 12h), year 23 (AD 159/60). Laureate head r. R/ Serpent with head of Sarapis, crowned with kalathos, erect, on back of horse, saddled and bridled, walking r. RPC IV.4 online 14989 (temporary); Dattari-Savio Pl. 2831. Brown tone, Fine

From the Dattari collection
Ex Naville Numismatics Auction 29, lot 413