Gallienus 253-268AD Antoninianus - Hippocamp reverse

3.26g

Obv: Radiate bust of Gallienus right "GALLIENVS AVG"

Rev: "NEPTVNO CONS AVG" Hippocamp right "N" in exergue

This type calls for the protection of Neptune in the revolt of Aureolus.  It didn't work as he was murdered by his own troops.

RSC 667, RIC 245, RCV 10292