Antoninus Pius, AE Drachm, Alexandria, Year 21 = 157-158 AD.

Obv: AVT K T AIL ADR ANTWNINOC CEB (or -CEBEVC),laureate head right.
Rev: Nilus seated right on rocks, holding cornucopiae from which a 
Genius holding wreath emerges; to left crocodile climbing up rocks. 
L-KA across fields. 

Milne 2359; Emmett 1620

With permission of Roma Numismatics, Oct, 2010