According to Sear
Aes Rude served the economic needs of central
Italy prior to the introduction of coined
money. They took the form of irregular lumps of bronze of widely varying weight and lacking any kind of official stamp or mark of value. The range of weight seems to be from c.8gms to over 300gms.
Without a secure archaeological context I do not see how one could differentiate between genuine
Aes Rude and irregular lumps of bronze of indeterminate date and origin which could simply be a bronze-smith's scrap.
Alex.