Ridge Helmet Naming?

[Robert Vermaat]

The Burgh Castle Helmet had a quadripartite bowl.

My bad, you are correct, I now recall that I have even seen it reconstructed as an Intercisa-type (in Dan Shadrakes book).

(Pic of the find on top of an early reconstruction)
http://www.durolitum.co.uk/articles/helm...castle.jpg

Indeed- that's the one! Intercisa-cheek plates but with a nasal.

The Intercisa Helmets: Both early and later reconstructions.
http://late-roman-empire.ru/_ph/7/344419009.jpg

From left to right: 4, 1, 2, 3. The original intercisa III may have had a base ring, which they interpreted as part of the helmet bowl itself. The intercisa IV is missing a ridge in its early and later reconstruction, so they sort of superglued the crest onto it or something.
The Worms helmet had a 1/2 base ring.[/quote]
As far as I know, none of the helmets found at Intercisa had a base ring, and I (indeed) only know the Worms to be an exception to the 'rule'. Intecisa helmets have holes all around the bottom of the bowl, which indicates leather edging, instead of a base ring.