Probus, AE antoninianus, Siscia. 22 mm, 3.51 g. 

IMP C PROBVS PF AVG, radiate, cuirassed bust left, spear
over shoulder.
ADVENTVS AVG, Emperor riding left, holding sceptre
and raising right hand
Mintmark XXIV. 

626 var (bust type); Hilard-Oliva 23 (this coin).

With permission of auctiones.ch, eAuction #42, Lot 97.
 Estimate: CHF 50.00