Quietus. Usurper, AD 260-261. Antoninianus. 22mm, 3.92 gr. Samosata mint. 

IMP C FVL QVIETVS P F AVG, radiate, draped bust right, seen from behind. 
MARTI PROPVGNATORI, Mars advancing right, holding spear and shield; 
star in lower right field. 

RIC V 7 corr. (star); MIR 1737n; RSC 9 corr. (ditto); Sear 10825. 

Extremely rare.

The authors of RIC were unable to confirm the existence of this 
type for Quietus, but suspected it as probable because Mionnet
and then Cohen listed it. 
This example is possibly the second example known to date. 

With permission of cngcoins.com. Electronic Auction 281, lot 416, June 2012.