Very rare and sought after type of heroic naked bust with a spear and egis, especially the rare type with PAX on the reverse.
Roman Imperial
Probus (276-282), Antoninianus 277, Ticinum mint
Obverse: bust of the emperor right
VIRTVS PROBI AVG
Reverse: Pax standing left, holding olive branch and sceptre, VXXT in exerque
PAX AVG
Weight 3.3 g