Probus, 276-282. Antoninianus (Billon, 24 mm, 4.18 g, 5 h), Serdica, 277. IMP C M AVR PROBVS P F AVG Radiate and mantled bust left, holding eagle-tipped scepter. Rev. SOLI INVICTO KAA Sol, head left, raising hand and holding whip, in spread quadriga facing. RIC 861. Lustrous and sharp, a magnificent example with intact silvering. Extremely fine.