I believe this is Constantius II with a Falling horseman on the reverse. It may be from the Sirmium Mint. I’m just not good on ancient coins but I like them. This one has a clip on the edge.
Actually it shows a bit Roman propraganda. The nobles are telling the citizens that they can protect them from the barbarians. The symbolism on the reverse of the coin pictured on the previous page is shown to the right. A Roman is shown slaying a barbarian who is prostrate on a fallen horse. Such images were made to assure Romans that the empire would protect them. “Fel Temp” refers to “the restoration of happy times.” Obviously it would not be a "happy time" for the barbarian.
These FEL TEMP coins were not merely propaganda. During the reign of Constantius II, Rome was almost constantly at war with someone, usually Persians and Germanic people. This coinage commemorates actual battles.
Mine has the ancestor of the michelin man. Constantius II (337 - 361 A.D.) Æ3 O: D N CONSTANTIVS P F AVG, pearl-diademed, draped, and cuirassed bust right. R: FEL TEMP REPARATIO (happy times restored), soldier rushing left spearing fallen horseman, soldier in military garb with helmet and shield on left arm, soldiers right foot on shield on the ground, horseman laying across his stumbled mount, bare-headed, without beard, raising left hand in helpless defense. Nocomedia Mint 2.01g 16.9mm RIC Nocomedia 96 variant