Watch List notes:

PROBUS. Antoninian. (Ae. 4.07g / 21mm). 280 AD Siscia. (RIC 706). Anv: IMP C PROBVS PF AVG. Laureate bust of Probus on the right with cuirass. Rev: PAX AVG. Pax shelf to left carrying palm and scepter to right Q, in exergue XXI. AU. Beautiful specimen.