Bronze antoninianus, 23mm, 3.99gm, issued AD 276-282 Siscia mint.
Obv: IMP C M AVR PROBVS AVG, Radiate, draped, cuirassed bust right.
Rev: CONSERVAT AVG (XXIB in ex.), Sol, radiate, standing left, raising right hand and holding globe in left hand.
References: see Sear 11969, RIC 671.
Mintmark unlisted for this type.