So I was looking at the Neapolis coins that served as prototypes for the earliest coins in the name of Rome. And, Apollo has a very flippy hairdo of a not terribly typical type. Here’s another to prove I’m not making this up:
That flip was feeling familiar. And not from just the Roman type (RRC 1/1):
Here’s a link to one more of these. Anyway. It struck me that that hair flip is visually quite related to the neck flap that appears on Roma’s helmet on certain early types like these:
Or to a lesser extent on these earlier bronzes (not to mention Rome’s first silver piece with bearded Mars and Horse’s Head probably also minted at Neapolis, modern Naples):
But that’s clearly not the direction of influence. The culprit must be the pegasi of Corinth that became so common in S Italy at the end of the 4th century BC:
The interesting iconographic borrowing isn’t really the Roma helmets, but the Neapolis (and soon-to-be-Roman) Apollo who gets his flip and snaky tendrils by way of Athena’s Corinthian manifestation.
Update 4 March 2014: Check out images of Roman types at Nick Molinari’s site, note especially the image of the RRC 2/1, known from only one specimen.