Gallienus, Antoninianus, Rome mint. 19 mm.

GALLIENVS AVG, radiate head right.
APOLLINI COS AVG (sic), Gryphon walking left.
Officina letter Delta in ex.

RIC V-1, Rome 166 (Sole reign) var (engravers error in 
reverse legend: COS AVG instead of CONS AVG).
Rare.
An official coin, sold on ebay, found in NE England.

Courtesy of ebay seller "babbola", Oct. 2010