Roman Empire, Probus Ant. RIC 861 var.

Obv:– IMP C M AVR PROBVS P F AVG, Radiate bust right in imperial mantle, holding sceptre surmounted by eagle
Rev:– SOLI INVICTO, Sol in spread quadriga, holding globe, whip and billowing cloak.
Minted in Serdica (Gamma in exe). Emission 3. Officina 3. in A.D. 277
References:– RIC 861 var.
This Bust type is not listed in RIC. Also this coin is undoubtedly of the style of Serdica but the emission mark does not match that of any published emission mark for Serdica. There is growing evidence of an unlisted second series of mintmarks used during the third emission of Serdica using Greek letters that ran in parallel to the Roman equivalent.