This very old Roman coin of Trajan Decius is in nice condition, and is a silver Antoninianus
Obverse Legend reads: IMP.C.M.Q.TRAIANVS DECIVS AVG."
Radiate, Cuirassed bust of Trajan Decius to the right.
Reverse legend reads: GENIVS EXERC.ILLYRICIANI"
Genius In Roman religion, "the genius is the individual instance of a general divine nature that is present in every individual person, place, or thing. Much like a guardian angel, the genius would follow each man from the hour of his birth until the day he died".standing in front nude but for chlamys (short cloak men wore in ancient Rome & Greece), head facing left holding patera (shallow dish) over lighted altar in his right hand and in his left hand a cornucopia (abundant supply of good things), in field to right a signum (something that marks or identifies or represents the ruler, signature).
249-51 AD
Cohen 49
RIC 16c