Constantius II AE3 of Constantinople. 351-355 AD. 

DN CONSTANTIVS PF AVG, pearl-diademed, draped and cuirassed 
bust right.
FEL TEMP R-EPARATIO, soldier spearing fallen horseman, 
who is unbearded, wearing a Phrygian helmet, clutching 
horse's neck. 

Stylized Epsilon resembling C< in left field
Mintmark CONSI (unpublished officina).

RIC VIII Constantinople 115 var.

The stylized Epsilon in the reverse left field is
practically unique to this series. It looks like E<
and is described in RIC simply as an epsilon.

Collection of Contributed by Randygeki(h2) of the Forum Ancient Coins, Mrz, 2016