Probus, Antoninianus, Serdica, AD 277. 

IMP CM AVR PROBVS AVG, radiate bust right, wearing 
imperial mantle.
SOLI INVICTO, Sol in spread quadriga, holding globe and 
raising right hand.

Mintmark KA dot A dot. 

RIC V-2 Serdica 862 var (bust type).

With permission of Numismatik Lanz, Auction 114, lot 720, May 2003.