Constantius II, AE3.

DN CONSTAN-TIVS PF AVG, pearl diademed, draped, cuirassed bust right
FEL TEMP-REPARATIO, soldier spearing fallen horseman who is 
bare-headed, bearded, reaching backwards.

Mintmark CONSA dot

RIC VIII Constantinople 135, rated Rare

sold on ebay for $12.50 by "coinsandrings", November, 2009