Bronze antoninianus, 19mm, 3.38gm, issued AD 267/268 Rome mint.
Obv: GALLIENVS AVG, Head of Gallienus, radiate, right.
Rev: NEPTVNO CONS AVG, Hippocamp or capricorn, right.
References: Sear 10292, RIC 245.
This coin fits the following collection focus(es): Gallienus' Zoo Series.