260-268 AD., Gallienus, Siscia mint, Æ Antoninianus, unlisted (would be Goebl system no. 1476A b).

Gallienus, Siscia mint, officina 2, 260-268 AD.,
Æ Antoninianus (ø 19-20 mm / 4,53 g), bronze, axis medal alignment ↑↑ (ca. 0°),
Obv.: GALLIENVS AVG , his radiate head r., one ribbon behind, one forward over shoulder, typical Siscia portrait style.
Rev.: PROVI AVG / II , Providentia standing left, her r. holding baton pointing down at globe at foot, her left holding cornucopiae, officina symbol II in left field.
unlisted (would be Goebl system no. 1476A b) ; RIC V, I, p. 182, no. 580K var. (RIC lists no reverse mark II in left field) .

Thanks to Frank from Portimao confirming the reference