Probus AE antoninianus. Serdica. AD 276-282. 4.51 g.
 
Obv: IMP CM AVR PROBVS PF AVG, radiate, helmeted and cuirassed bust, left, holding spear and shield.
Rev: SOLI INVICTO, Sol in spread quadriga facing, holding 
whip.
Mintmark KA dot delta dot

RIC V-2 Serdica 861, rated common.

With permission of Emporium Hamburg - Auction 95, Lot 663, Nov 2021.