Bronze AE3, 22mm, 4.86gm, issued AD 350/351 Treveri mint.
Obv: DN MAGNENTIVS PF AVG, Bare-headed, draped and cuirassed bust facing right, A behind.
Rev: GLORIA ROMANORVM (TRS in ex.), Emperor on horseback spearing kneeling barbarian.
References: Sear 18798, RIC 271.