Searching for pictures of early Gladiator helmets

[Medusa Gladiatrix]

The Museum für Kunst und Gewerbe in Hamburg disposes of a helmet dating 1st century BC which resembles a bit the helmet of Richard's link. It has the inventory no. 1917/173 and is shown on page 44 of the catalog "Gladiatoren und Caesaren - Die Macht der Unterhaltung im antiken Rom".

I just visited recently the newly reopened collection of antiquities but unfortunately this helmet is not on display :-(

I wish you good luck contacting them.