Carus, AV aureus, Siscia. 20 mm, 5.16 gr. 

IMP C M AVR CARVS P F AVG, laureate, draped, cuirassed bust right.
MARTI PROPVGNATORI, Mars in military dress, advancing right, holding 
spear and shield. 

RIC –; C –; Calic̣ –.
Apparently unique and unpublished. Good extremely fine 

With permission of Numismatica Ars Classica NAC AG, auction 25, lot 569.
Sold for 12,000 SFr.