Gallienus, AE antoninianus. Milan mint. Joint reign. AD 258. 

GALLIENVS AVG, radiate and helmeted bust left, holding spear
and shield.
LEG III ITAL VI P VI F, Ibis or stork standing right.

RIC V-1, Milan 339 (J).
Rare.

With permission of cngcoins.com, 2003.