From beastcoins.com

Probus, Antoninianus, 278, Fifth Emission, Siscia, Officina 6 - RIC 
V, Part II, 816
Item Number : 39902
Ended Sunday, February 18, 2007
Seller beastcoins
Estimate:  US $ 35

Probus, Antoninianus, 278, Fifth Emission, Siscia, Officina 6 

IMP C M AVR PROBVS P AVG, Radiate, cuirassed bust left, spear 
in right hand over shoulder, shield in left 
VIRTVS PROBI AVG, Mars, heroically nude, walking right, spear 
pointing forward in right hand, trophy in left over shouleder 

Mintmark XXIVI in exergue
22mm x 23mm, 4.41g 

RIC V, Part II, 816 var (Mars unclothed); Alfoldi 96-164.

Ex Tony Hardy Collection