Very interesting double struck on the obverse, which resulted is two busts of Gallien.
Roman Imperial
Gallienus (253-268), Antoninianus 263, Rome mint
Obverse: radiate head right
GALLIENVS AVG
Reverse: Providentia standing left, holding wand and cornucopia, in the left field X
PROVID AVG
Diameter 24 mm, weight 2.75 g