Aes grave ("heavy bronze") is a term in numismatics indicating bronze cast coins used in central Italy during the 3rd century BC, whose value was generally indicated by signs: I for the as, S for semis and pellets for unciae.
Standard weights for the as were 272, 327, or 341 grams, depending upon the issuing authority.
[1] The main Roman cast coins had these marks and images:
Main series were from Rome, Ariminum (Rimini), Iguvium (Gubbio), Tuder (Todi), Ausculum (Ascoli Satriano), Firmum (Fermo), Hatria - Hadria (Atri), Luceria (Lucera), and Latin central Italy.
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