RIC does not list this workshop. It looks like RQ, but it belongs to the series that uses Greek workshops, so A,B, Δ, Γ etc.
It also looks like it is draped and cuirassed; which is also unlisted.
Probus
A.D. 276- 282
Ӕ Antoninianus
22x24mm 4.5g
IMP C M AVR PROBVS AVG; Radiate and draped bust right
VIRTVS AVGVSTI; Mars walking right, spear in right hand pointing forward, trophy over left shoulder.
In ex. RS
RIC V Rome 240
