Magnentius. AE3. Trier. 350-353 AD. 25 mm, 6 g. 

IM CAE MAGN-ENTIVS AVG, bare-headed, draped, cuirassed 
bust right, A behind bust
FEL TEMP-REPARATIO, emperor standing left on galley, 
holding Victory and labarum, Victory seated at the helm. 

A in left field.
Mintmark TRP. 

RIC VIII Trier 260; Bridgnorth Hoard 88.

Image Courtesy of York Coins, the Bridgnorth hoard.