Trajan Decius (249-251). AE Semis, Rome mint, 249-251 AD. Obv. IMP C M Q TRAIANVS DECIVS AVG. Laureate and cuirassed bust right. Rev. SC. Mars standing left, holding shield set on ground and spear. RIC IV 128; C. 102. 4.20 g. 17.50 mm. R. A choice example with lovely light green patina. Slightly rough surface on reverse. VF.