Viminacium in Moesia Superior, 250-251 AD., Trajan Decius, Dupondius, cf. AMNG 129.

Viminacium in Moesia Superior, Trajan Decius, 250-251 AD.,
Æ Dupondius (22-23 mm / 4.92 g),
Obv.: IMP TRAIANVS DECIVS AV , radiate, cuirassed bust of Trajan Decius right, seen from behind.
Rev.: PMS C-OL VIM / AN XII , Moesia standing between bull and lion.
unlisted
cf. AMNG I, 46, 129 (draped and cuirassed bust) ; Wildwinds: _viminacium_Martin3-07-1.

VIMINACIUM (today Kostolac near Pozarevac in Yugoslavia) was first the camp of the legion VII. CLAUDIA from the 1.st century a.d.. At the beggining of the reign of Hadrian it probably received the status of muncipium and in the middle of the 2nd century (possible even earlier) it became the center of the governor of the province Moesia Superior. At the beginning of the reign of Gordian III. it became a colony and it seems that with this rank it was given the right to strike copper coins.

further information:
http://www2.arnes.si/~sspbmate/VIMINACIUM.htm