What's the weight and diameter of that? It's either a sestertius or as of Trajan Decius with the Pannonia reverse type. I have one that isn't exactly FDC: Trajan Decius AD 249-251. Roman Æ sestertius, 15.11 g, 29.4 mm, 1 h. Rome, AD 250-251. Obv: IMP CMQ TRAIANVS DECIVS AVG, laureate and cuirassed bust right. Rev: PANNONIAE S C, the two Pannoniae standing side by side, holding standards. Refs: RIC 124a; Cohen 87; Sear 9407; Hunter 54.
Sestertius like mine. Sestertii in the mid-third century weighed about half of what they did 200 years earlier.