Very nice. I bought a couple of Decius coins last week as it happens. One is a similar type to the OP.
Trajan Decius
Obv:- IMP C M Q TRAIANVS DECIVS AVG, Radiate, draped, cuirassed bust right
Rev:- GENIVS EXERC ILLVRICIANI Genius standing front, head to left, holding patera over lighted altar in his right hand and cornucopiae with his left; in left field, standard
Minted in Rome. A.D. 249 - 251
Reference(s) - RIC 17b. RSC 56
4.01 gms, 22.51mm. 180 degrees

The other is one of the PANNONIAE varieties
Trajan Decius
Obv:- IMP C M Q TRAIANVS DECIVS AVG, Radiate, cuirassed bust right
Rev:- PANNONIAE, The two Pannoniae facing each other, holding a standard between them
Minted in Rome. A.D. 249 - 25
Reference(s) - RIC 26. RSC 81
3.41 gms, 21.54mm x 180mm
