Note: very interesting variant of military bust with Pegasus right above undulating ground on shield and XXIP mintmark in exergue (instead of greek mark "A" which was typical for Siscia's 2nd and 3rd emmissions).
This coin is unlisted in Alfoldi and is only the 2nd example of this (exact) type known (the other being in M. Vosper's collection)
OBVERSE: IMP C M AVR PROBVS P F AVG
REVERSE: ADVENTVS PROBI AVG
BUST TYPE: E1 = Radiate, cuirassed and helmeted bust left, holding spear and shield (shield decorated with Pegasus)
FIELD / EXERGUE MARKS: -/-//XXIP
WEIGHT 3.69g / AXIS: 6h / DIAMETER: 21mm