I have several dozen coins of Gallienus, but every now and again I find one that is really cool and unusual. What a cool reverse. I would imagine that the design is in reference to a triumphal column, or perhaps an outdoor altar, surmounted by a Zeus statue, but I have not found any proof of this.
It was minted during Gallienus' third consulate, in AD 257. It celebrates the victories of Gallienus on the Rhine. The reverse shows a statue of Jupiter (IOVI VICTORI) on a base inscribed "IMP CES".
I have a question. Was the verbiage IMP CES used to keep each line 3 letters, or was CES an acceptable abbreviation for CAESAE? I’ve never seen CES in any other context myself