Vendel helmet 7th century. Pre Viking Sweden

 

Deir El-Medina helmet

 Article on this Spangenhelm here

The Deir El-Medina (or Dar al-Madinah) Spangenhelm, possibly one of the earliest examples of this helmet type in use. This helmet is notably different to other late Roman examples, and debate remains to this day about the exact datation.

Wollaston or Pioneer helmet

 Rare 7th century helmet. Wiki

Reconstruction

Staffordshire Hoard helmet reconstructed

 Article here

Thegns of Mercia reconstruction

 Thegns of Mercia: The Wollaston / Pioneer Helm (thethegns.blogspot.com)

Intercisa helmets

 Article on the Intercisa helmet. They have this image which I haven't seen before. Detail of a fresco in the catacombs of San Giovanni in Syracuse ...

https://magister-militum.co.uk/blog/intercisa-helmets

Budapest helmet

 

A richly decorated helmet. Here.

Also see here where the image is from

Armae late Roman helmets

 Here for a fine range of helmets. Prices seem good. 

Burgh castle helmet

 More here

Repro Burgh Castle helmet

 Here for this Deepeeka helmet. 

Late Roman Ridge helmet

 Wiki

Roman ridge helmet (Berkasovo I), early 4th century AD. Made of iron and sheathed in silver-gilt, it is decorated with glass gems. From the "Berkasovo treasure", Museum of Vojvodina, Novi Sad (Serbia).