Probus, AE antoninianus, Siscia. 23 mm, 3.97 g. 

IMP CM AVR PROBVS PF AVG, radiate, helmeted, cuirassed bust 
left, holding spear and shield.
CONSERVAT AVG, Sol standing left, holding globe and 
raising right hand.

Mintmark XXIQ.
RIC V-2 Siscia 670

With permission of auctiones.ch, eAuction #42, Lot 98. 
Estimate: CHF 50.00