On dating of the late roman helmets.

[Flavivs Aetivs]

What's interesting is that in Roman art, the Ear guard found on the Coblenz helmet seems to become prevelant in the 5th century on ridge helmets. Just look at the Amazonomachy Mosaic, or those Wood/Ivory Carvings from Egypt of the Quintani.

Also, the Santa Maria Maggiore Arch, which dates to 431 AD, depicts lots of Iatrus-type helmets. (Two-piece bowl with Berkasova Style Cheekpieces). A few helmets have a line indicating a continued use of quadripartite construction.

[Caratacus]

Do you know of tis publication?

Vogt, M. (2006), "Spangenhelm", published by RGZM, Mainz.K.39

Mike Thomas
(Caratacus)

[Tursius]

Having been a soldier, I think it very probably that in the late period that there were hybrids between styles. These hybrids may have been localized even.

[Crispianus]

Do you know of tis publication?

Vogt, M. (2006), "Spangenhelm", published by RGZM, Mainz.K.39

Mike Thomas
(Caratacus)

Theres also an extensive article: "Die frühmittelalterlichen Spangenhelme und die nordischen Helme der Vendelzeit" by K. Böhner in "Jahrbuch des Römisch-Germanischen Zentralmuseums Mainz v. 41, no. 2, 1994, pp. 471-549"