Probus, AE antoninianus, Siscia. 23 mm, 3.72 g. 

IMP CM AVR PROBVS PF AVG, radiate, cuirassed bust left,
holding spear and shield.
VIRTVS PROBI AVG, emperor on horseback, galloping right, 
holding spear, captive kneeling left before the horse,
arms outstretched.
Mintmark XXIQ. 

RIC V-2 Siscia 817; Sear 12073. 

With permission of auctiones.ch, eAuction #42, Lot 101. 
Estimate: CHF 75.00