Like several other helmets, the original was found in the River Rhine at Mainz, including one with the inscription of a soldier named L. Lucretius Celeris of Legio I Adiutrix (a legion which was stationed at Mainz from 71 to 86 AD, dating the helmet to this period).
used along with the winged horse Pegasus, on the helmets the symbol used by I Adiutrix legionaries was a dolphin.
Legio XVIII | Legio XVII | Legio XV Apollinaris | Legio XIX | Legio V ''Iovia'' | Legio V Iovia | Legio VI Herculia | Legio VI Ferrata | Legio II Augusta | legio VI Ferrata | legio III Gallica | Legio XX Valeria Victrix | Legio XIV Gemina | Legio X Equestris | Legio VI ''Ferrata'' | Legio IV Scythica | Legio II ''Augusta'' | Legio I Adiutrix |