c'est un antoninien de Gordien III frappé à Antioche (encore!!!) en 238/239
Gordian III AR Antoninianus. Antioch mint, AD 238-239.
IMP CAES M ANT GORDIANVS AVG, radiate draped & cuirassed bust right /
VIRTVS AVG, Virtus standing left holding spear & resting hand on
shield.
RIC 109
http://www.wildwinds.com/coins/ric/gordian_III/i.html