Bronze antoninianus, 23mm, 3.86gm, issued AD 280 Cyzicus mint.
Obv: IMP C M AVR PROBVS P F AVG, Radiate bust left wearing imperial mantle, holding sceptre surmounted by eagle in right hand.
Rev: SOLI INVICTO (XXI in ex.), Sol, radiate, in spread quadriga, holding whip, CM in centre field.
References: Sear 12041, RIC 911.