Trajan Decius (249 - 251 A.D.) Obv: IMPCMQTRAIANVSDECIVSAVG - Laureate, cuirassed bust right. Rev: ABVNDANTIAAVG - Abundantia standing right, pouring out cornucopia In that condition, maybe $15-$20.
More info: Rome mint. 4th emission, AD 250. Radiate, draped, and cuirassed bust right, seen from behind / Abundantia standing right, emptying contents of cornucopia. RIC IV 10b; RSC 2