Probus AE Antoninianus, 4.15 g.

Obv: IMP PROBVS INV AVG, radiate, draped bust right.
Rev: SPES AVG N, Spes standing left, holding flower and raising 
hem of robe. 

XXI in exergue. 
Siscia mint AD 276 
RIC V-2, 790, rated scarce.

Courtesy of Philippe Gysin, April 2008