The second ancient one is a Sestertius or As (we need to know the diameter and weight to be sure) of Septimius Severus (193-211 AD) with reverse of Roma (?) holding Victory and spear.
The third ancient is an AE centenionalis of Magnentius (350-353 AD) with reverse of the emperor on horseback spearing an enemy soldier.
Further down is an AE As of Domitian (81-96 AD) with reverse of Minerva holding spear and shield . . . but this one looks strange to me and might possibly not be authentic.
Below that is an AE Sestertius of Caracalla (193-217 AD) with reverse of Virtus leaning on a shield and holding Victory, a captive at his feet.
Next is an AE Sestertius of Severus Alexander (222-235 AD) with reverse of Alexander in military garb walking right, carrying a spear and trophy.
Finally there is a follis of Constantine the Great (307-337 AD) with reverse of Mars holding a spear and shield and reverse legend MARTI PATRI CONSERVATORI, Latin for "Mars, the saving father".
Paul Bulgerin