Gallienus AE As. Sole reign, Rome, AD 253-254. 23 mm, 7.89 g.

IMP C P LIC GALLIENVS AVG, laureate and draped bust right.
VOTIS-DECENNE-LIBVS in three lines within wreath. 

RIC 406 var (denomination); MIR 40gg. 
Very Rare. 

Reportedly ex Duke of Argyll Collection.
With permission of Roma Numismatics Ltd - E-Sale 69, Lot 1080, April 2020