Pues parece que es de la 3ª emisión de Roma 6ª oficina:
Numerian, Rome
IMP NVMERIANVS AVG, radiate, cuirassed r., seen from front,
folds of cloak on both shoulders
VNDIQVE VICTORES Numerian standing left, holding globe and scepter; seated captive on either side
KAS in ex.
22mm, 3.1gr, Die 180
RIC V-II, 423, bust type F
Scarce.
http://wildwinds.com/coins/ric/numerian/RIC_0423_captives.jpg
Un saludo
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"Qvod tibi fieri non vis, alteri non feceris"