Es un AE3 de Constancio II tipo "matao" de la ceca de Roma 3ª oficina:
Constantius II AE3 18mm. DN CONSTANTIVS P F AVG, pearl diademed, draped, cuirassed bust right / FEL TEMP-REPARATIO, soldier spearing a fallen horseman, who is bare-headed, reaching backwards. Mintmark RT palm branch. Rome RIC VIII 282
http://wildwinds.com/coins/ric/constantius_II/_rome_RIC_viii_282.jpg
Un saludo
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"Qvod tibi fieri non vis, alteri non feceris"