Gallienus (253-268). BI Double (?) Antoninianus, Mediolanum mint. Obv. GALLIENVS AVG. Radiate head right. Rev. VIRTVS AVG. Mars standing facing, head left, resting right hand on shield and holding spear. Cf. RIC V 534. BI. 5.54 g. 19.70 mm. RRR. Very interesting example, struck on thick and overweight flan. Traces of silvering. About VF. ���
Very rare heavy specimen, weighting twice the standard weight for an antoninianus of this period. Such anomalous issues are known for a number of reigns in the later third century AD.