Silvered bronze antoninianus, 21mm, 3.57gm, issued AD 265 Sirmium? mint.
Obv: GALLIENVS AVG, Radiate head facing right.
Rev: VICTORIA AET, Victory standing left holding wreath and palm, SP across.
References: Sear 10380, RIC 586, RSC 1071a.
The SP in the reverse field may stand for "Secunda Pannonia", refering to a Balkan mint.