Trajan Decius (249-251 A.D.) -  AR Antoninianus - 21.30x20.18mm, 3.85gr
Obverse - IMP C M Q TRAIANVS DECIVS AVG
Trajan Decius, his radiate, draped and cuirassed bust right
Reverse - DACIA.
Dacia, standing left, holding staff surmounted with wolf's head.
(= draco battle standard, carried by Dacian troops).

Minted in Rome 250 or 251 A.D.
Reference:
Mattingley, Sydenham, & Sutherland, "Roman Imperial Coinage", Volume 4, Part 3 (RIC), p121, nr. 12b
Sear, D.R., "Roman Coins and their Values" (RCV Millennium Edition), Vol. 3, p198, nr. 9368
Sear, D.R., "Roman Coins and their Values" (RCV 4th Revised Edition), p246, nr. 2693
Cohen, H, "Descriptions Historique des Monnaies frappees sous l'Empire Romain" (C), Volume 5, p187, nr. 16
Seaby, H.A. & Sear, D.R., "Roman Silver Coins" (RSC), Volume 4, p25, nr. 16
Van Meter, D., "Handbook of Roman Imperial Coins", p231, nr 6, variety with Ol/6.
Suarez, R., "Encyclopedia of Roman Imperial Coins" (ERIC),  p267, nr 10  (B5, O2, R06, T03, M3)
Quality: Very Fine+