Bronze antoninianus, 22mm, 2.92gm, issued AD 276-282 Serdica mint.
Obv: IMP C M AVR PROBVS AVG, Radiate bust left wearing imperial mantle and holding sceptre surmounted by eagle.
Rev: SOLI INVICTO (KAB in ex.), Sol, radiate, in spread quadriga, holding whip.
References: see Sear 12040, RIC 862.
Some cleaning.