Watch List notes:

Probus, 276-282. Antoninianus (Billon, 23 mm, 3.56 g, 7 h), Serdica, 3rd officina, 277. IMP C M AVR PROBVS P F AVG Radiate bust of Probus to left, wearing imperial mantle and holding eagle-tipped scepter with his right hand. Rev. VIRTVS PROBI AVG / KA•Γ• Probus, in military dress, riding horse galloping to right, spearing enemy. RIC 878 var. (this bust type not recorded). A rare variety. Nearly extremely fine.