Old Roman coin to identify 5.

Gallienus

I bet a variation of  RIC 330 (Vi-sole reign)

This variety is not listed in RIC and not yet on Numista with obv legend : GALLIENVS AVG

One similar coin HERE that explains : 

Göbl 636a Variant of RIC 330 which has listed obverse legend as "IMP CAES GALLIENVS AVG".

So you might enter this new coin in the Numista database : 

Antoninianus - Gallienus (VIRTVS AVGVSTI)

Bust: Radiate head right

GALLIENVS AVG

Virtus standing left, stepping on helmet, holding branch and spear.

VIRTVS AVGVSTI

X in left field

Ref: Gobl MIR 636a