Constantius Gallus AE3 "Centenionalis", Alexandria, 351-354 AD. 

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

Dot-S-dot in left field
Mintmark ALEA 

RIC VIII Alexandria 79; cf Sear 4055.

Used with permission of TimeLine Originals (www.time-lines.co.uk), October, 2009