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.
AND, just as icing on the cake, the rostrum on the uncia confirms Kondratieff’s interpretation of the currency bar iconography from a different angle. [HN Italy got the uncia identification right, but still kept the trident of RRC.]
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…
Update 4/22/2014: The main study of the Ariminum mint is available online: G. Gorini, La monetazione di Ariminum, Revue Numismatique 2010