Trajanus Decius, AR Antoninianus, 

IMP TRAIANVS DECIVS AVG, radiate, draped and cuirassed bust right. 
DACIA, Dacia standing left, holding a staff surmounted with the 
head of an ass. 

RSC 13, RIC 2b.

With permission of numislanz.de, Auktion 102, lot 912