Very rare variant. Guillemain only cites 4 examples. Virtually as struck and with full original silvering. Very rare in such an exceptional state of preservation.
Obverse: IMP C M AVR PROBVS P F AVG
Reverse: ROMAE AETERNAE = Roma seated in temple
BUST TYPE: A = radiate, draped and cuirassed bust right, seen from front
FIELD / EXERGUE MARKS: -/-//Rζ
WEIGHT 3.74g / AXIS: 6h / DIAMETER: 24mm
MINT: Roma