Antoninianus - Probus Cuirassed, spear and shield, left; PAX AVG; Pax

RIC 706 was minted by the 1st to 6th officina of the Siscia mint. The original RIC text mentions multiple different variations/different bust types, listed below (bust types according to Pierre Bastiens grouping of bust types; see illustrated: probvs.net). The sixth variation (the F5 bust) could also be considered as a variant because RIC only mentions with spear and shield, not with only a spear. Alföldi lists five of the six variants (Andreas Alföldi, Vorarbeiten zu einem Corpus der in Siscia geprägten römischen Kaisermünzen. Heft V. Verzeichnis der Antoniniane des Kaisers Probus, Budapest, 1939):

1. radiate, draped, right (bust A, Alföldi 041.016, probuscoins.fr #3623, Numista #293062);
2. radiate, cuirassed, right (bust B, Alföldi 041.017-034, probuscoins.fr #1754, Numista #293734);
3. helmeted, radiate, cuirassed, left, holding spear in right hand and shield in left hand (bust E1, Alföldi -, probuscoins.fr -, Numista #293735);
4. radiate, cuirassed, left (bust B1, Alföldi 041.035-047, probuscoins.fr #1753, Numista #293736);
5. radiate, cuirassed, left, with spear and shield (bust F1, Alföldi 041.052-054, probuscoins.fr -, this coin).
6. [var] radiate, cuirassed, left, with spear (bust F5, Alföldi 041.048-047, probuscoins.fr #3764, not in Numista).

Alföldi also mentions the existence of an A2 bust variant: radiate, draped and cuirassed, right (Alföldi 041.014-015).

According to Pink, RIC 706 was part of the 4th emission (year 278, mint-/exergue mark style: -/-//XXIP) and 7th emission (year 280, mint-/exergue mark style: -/P//XXI) (Karl Pink, Der Aufbau der römischen Münzprägung in der Kaiserzeit VI/I, Wien, 1949, p. 41).