Probus, Antoninianus, Serdica, AD 277. 24 mm, 4.24 g. 

IMP C M AVR PROBVS AVG, radiate, draped and cuirassed bust right.
VIRTVS PROBI AVG, emperor on horseback, galloping right, 
holding spear, captive kneeling left before the horse, arms 
outstretched. 

Mintmark KAB.

RIC V-2 Serdica 878; Sear -.

With permission of Numismatik Lanz, Auction 114, lot 719, May 2003.