A Nice Unmessed With Named and Unit Marked Imperial Japanese T-90 Army Helmet

This is a nice uncleaned and unmessed with named and unit marked WWII Japanese T90 army helmet.

On the helmet skirt is says 六高射砲井滝 (Roku kōsha-hō Itaki)
6 Anti-Aircraft Cannon --(owners sir name) Itaki

Here Is The Grouping This Helmet Came In