Watch List notes:

Probus, 276-282. Antoninianus (Billon, 18 mm, 4.05 g, 12 h), Serdica, 277. IMP C M AVR PROBVS AVG Radiate, cuirassed and helmeted bust of Probus to left. Rev. S-OLI INVICT-O / KA.A. Sol, radiate, in facing spread quadriga, with his head turned left, his right arm raised and with whip in his left. Cohen 678 var. RIC 862 and 864 var. Rare; well centered, lustrous and appealing. Extremely fine.