Gallienus Billon Antoninianus. Samosata mint, ca 260-261 AD.

Obv: (dot) IMP C P LIC GALLIENVS P F AVG, radiate draped bust right
Rev: VIRTVS AVG, emperor standing right, holding transverse spear, receiving
wreath from Roma standing left, holding spear & shield.

RIC 457, listed in the Joint Reign section with a note, "The style of these
coins is of the joint reign." I guess they felt strongly about the style,
but I personally believe it's from the very beginning of the Sole Reign.

Göbl 1704m(2).

From the Dave Surber collection, from the $8 junk box of 
Rudnik Numismatics, September, 2005.