Constantius II. AE3. Rome.

Obv: DN CONSTAN-TIVS PF AVG, pearl diademed, draped, cuirassed bust right

Rev: FEL TEMP-REPARATIO, soldier standing left, spearing
fallen horseman who is wearing a Phrygian helmet, reaching
backwards.

Mintmark: R dot M dot B

RIC VIII Rome 314 corrected. Scarce.

Note: RIC describes the horseman of RIC 314 as being
bare-headed. 99% of the coins of this type that I have
seen all show the horseman wearing a Phrygian helmet.

From Dane's collection, April 2013.