Watch List notes:

Probus (276-282). BI Antoninianus, Serdica mint. Obv. IMP C M AVR PROBVS AVG. Radiate, draped and cuirassed bust right. Rev. PROVIDEN DEOR. Providentia standing right, holding signum in each hand; to right, Sol standing left, raising hand and holding globe; in field, star; in exergue, KA•Γ. RIC 845. BI. g. 3.89 mm. 22.00 A superb example, fully silvered, with iridescent tone. EF.