Very rare and desirable bust type. Only the 2nd example of this exact variant known (the other being in Vienna musem ex. Alexander Missong famous Probus collection).
Obverse: IMP C M AVR PROBVS P AVG
Reverse: VIRTVS PROBI AVG; Mars walking right, holding tropaion
BUST TYPE: F8 = Radiate, cuirassed bust left, holding spear and shield, seen from back; divergent wreath ties of the corona radiata
MINT: SISCIA
FIELD / EXERGUE MARKS: -/-//XXIV
WEIGHT: 3,26 g / AXIS: 12 h / DIAMETER: 21,5 mm