Trajan Decius AR Antoninianus. Rome mint, 249 AD. 

Obv: IMP TRAIANVS DECIVS AVG, radiate, draped & cuirassed bust right 
Rev: GENIVS EXERCITVS ILLVRICIANI, Genius standing left, holding patera and 
 cornucopia; standard to right.

RIC 4, RSC 63.

[imported from dirtyoldcoins.com, Sept.07]