Silver antoninianus, 21mm, 4.11gm, issued AD 250/251. Rome mint.
Obv: IMP C M Q TRAIANVS DECIVS AVG, Radiate, draped and cuirassed bust facing right.
Rev: GENIVS EXERC ILLVRICIANI, Genius of the Army holding patera and cornucopiae, standard behind.
References: Sear 9374, RIC 16c, RSC 49.