Probus, Antoninianus, Rome mint. 4.21 g.

IMP C PROBVS P F AVG, Radiate, helmeted, cuirassed bust 
left, holding spear and shield.
ROMAE AETERNAE, Roma seated in temple, holding Victory and sceptre.

Mintmark: R star Stigma.

Courtesy of the Philippe Gysen collection.
RIC 192