Constantius Gallus, AE 19.3mm, 4.59 g. Amiens.

DN CONSTANTI-VS NOB CAES, bare-headed, draped, cuirassed bust right
FEL TEMP RE-PARATIO, soldier spearing fallen horseman who is bare-
headed, reaching backwards.

Mintmark: AMB

RIC VIII Amiens 47. Rated scarce.

Contributed by Mark Smith, May 2010.

Note the bust type with its Magnentius-like 
features. 
Although the M of the mintmark could be confused with an 
N (ANB of Antioch), the features of the bust - 
especially the hair - shows it to be a coin of Amiens.