Gallienus, AE Antoninianus. 

Obv: GALLIENVS AVG, radiate head right.
Rev: DIANAE CONS AVG, Stag walking right.

officina mark XII below.

RIC 146, 179. Cohen 160.

Courtesy of Thierry Dumez, on www.muenzauktion.com/dumez/

December 2011.