Bronze ½ Centenionalis 2.3g Reduced to 19-22mm; 2.6-3.2g Square Leaded Bronze Copper AE2 Copper AE3 Copper AE4 Copper AE1 Bronze AE3 Bronze AE4 Bronze AE2 379AD 332AD 2.4g 3.4g 4.5g Post-Reform Laureate 15-18mm; 1.2-2.3g Copper ¼ Follis Double Sestertius Bronze Orichalcum Orichalcum Orichalcum Sestertius Copper Copper Bronze Copper Orichalcum 64 AD: Nero Orichalcum Quarter Unica Mid-Republic Struck Bronze Tripondius/Tressis Dupondius Semi-Unica Unica AS Triens Semis Quadrans Sextans Semi-Unica Unica Sextans AS Triens Semis Quadrans AES Signatum 249 AD: Trajan Decius AES Rude Early Republic AES Grave: Cast Bronze (289 BC) Billion AE1: Maiorina 7.6g Half Follis Follis (10.6g) Constantine I 309 AD 360-363 AD: Julian II 294 AD: Diocletian Post-Reform Radiate 24mm; 5-6.5g 317AD 307-308 AD Bronze 1/4 Follis 117 AD Radiate Crown Added Late Republic/ Early Imperial 500-300 BC