Probus, AE antoninianus. Serdica mint. 22 mm. AD 276-282.

IMP CM AVR PROBVS PF AVG, radiate, helmeted and cuirassed bust left, holding spear (point forwards) and shield.
CLEMENTIA TEMP, Emperor standing right, holding eagle-tipped 
sceptre and receiving globe from Jupiter, standing left, holding sceptre. 

Q in lower centre.
Mintmark KA. 

RIC V-2 643; Alföldi type 17.

With permission of Savoca Numismatik auction 22, Lot 535, April 2018.

Note: RIC describes the spear as one without the eagle tip, 
although there are examples of RIC 643 with one.