Bronze AE2, 23mm, 4.70gm, issued AD 350-353 Ambianum mint.
Obv: DN MAGNENTIVS PF AVG, Bare-headed, draped and cuirassed bust facing right.
Rev: GLORIA ROMANORVM (AMB in ex.), Emperor on horse right spearing barbarian.
References: Sear 18796, RIC 3.