here is a bit rarer reverse for Gallienus with Mercury
Gallienus
A.D. 266- 267
Ӕ Antoninianus
20x21mm 3.1gm
GALLIENVS AVG; radiate, draped and cuirassed bust right.
PROVIDENTIA AVG; Mercury stg. l., holding purse and caduceus.
In ex. VIIC
RIC V Antioch 653; Göbl 1651g
VIIC in the exergue means that this coin was issue during the seventh and last consulate of Gallienus; which began in A.D. 266.