Searching for pictures of early Gladiator helmets

[Olaf]

Brian, the helmets from Pompeii are well documented, but these are the helmets worn after the Augustan reforms. I am searching for the three examples that are predecessors of the visored helmet types, from the time when Gladiators were still fighting open faced with only cheek pieces attached to the helmet. These helmets would have been worn in Spartacus time until replaced by the Chieti type somewhere before 50AD.

The three known examples, that you can see in the Flickr pictures above are all displayed in America, so I was hoping somebody from Toronto, Detroit or Worcester Massachusetts might help out and get us some pictures of these. Especially the Detroit specimen seems to be quite elusive.