Trajan Decius (249-251).     AE Semis, Rome mint.   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.     3.07 g.   17.00 mm.      R.  Rare. Superb portrait. Nice olive green patina, with earthen deposits and turquoise spots.    Good VF.