Watch List notes:

Probus, 276 – 282. Antoninianus, Siscia 277, AR 3.79 g. IMP PROBVS P F AVG Radiate bust l., wearing consular robes, holding eagle-tipped sceptre in r. hand. Rev. CALLIOPE AVG Calliope standing r., playing lyre set on her l. knee, l. foot on rock. C 83 var. (draped and cuirassed). RIC –. Alföldi, Siscia V, pl. VI, 14.
Extremely rare. Very fine