Communities issuing aes grave with Latin Colonies highlighted (missing Volceii, sorry). Map cannot capture the numerous types not attributed to any specific location or group. Map created using AWMC: à-la-carte Map to which it links. [FYI – runs best for me in firefox rather than other browsers.]Crawford CMRR discusses the cast currencies of Italy in five groups (p. 43-46):
an as of about 300g maybe from 1st Punic War: Tarquinii, Tuder, Reate, Praeneste, Carseoli, and Firmum
a heavier as (350-450g): Ariminum, Hadria, Vestini, another unidentified mint maybe Asculum Picenum
an as of about 300g followed by reductions probably from 2nd Punic War: Luceria and Venusia
reduced as from rebel communities during 2nd Punic War: Volceii and Meles
issues of Etruria and Umbria (including Iguvium on map above) on 200g standard from time of 1st Punic War
He summarizes circulation and weight standard thus:
ANS Specimens of Ariminum Cast Bronze. Click image form more details.
It strikes me that that the cast bronze types of Ariminum bear a marked similarity to the types of the Roman currency bars. Ariminum became a Latin colony in 268 BC and the cast bronze dates to sometime after that date. The one type I couldn’t find to illustrate has a shield as the reverse type. Its as seems to be heavier than the Roman (350-400g) and it divides the as into a base-10, instead of base-12 fractions. It shares these characteristics with Hadria and Vestini (Crawford, CMRR, p. 43 & HN Italy p. 17).
Ariminum types above all represent different denominations. [Scale can be so deceptive in online images!] Shield = quincunx, Sword and scabbard = quadrunx, trident = teruncius, dolphin = biunx, rostrum = uncia, shell = semuncia.
This suggests they were created as a series at one moment in time. Perhaps they took their inspiration from the currency bars? With the exception of the shell all of these are well known images on the bars. Below is a collection of images to refresh your memory. And one more specimen of Ariminum, the trident of which better parallels the bars.
There is nothing that comes to mind that would preclude the possibility that the shield and sword currency bars were made at the same time as the naval types…
You may know ancient Ariminum better by its modern name Rimini.