Watch List notes:

Probus, 276-282. Antoninianus (Billon, 21 mm, 3.70 g, 6 h), Service, Δ = 4th officina, 277. IMP C M AVR PROBVS AVG Radiate bust of Probus to left, wearing imperial mantle and holding eagle-tipped scepter. Rev. SOLI INVICTO / KAΔ Sol, radiate, standing front in spread quadriga, with his head turned to left, his right arm raised and with whip in his left. C 574. RIC 862. Sharp, attractive and with original silvering. Extremely fine.