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Amongst the rarest of all WWII helmets of any combatant nation these remain something of a mystery. The general consensus is they were produced for use upon Shinyo suicide boats. This was a late war initiative where heavily armored small fast boats would be packed with explosives and literally rammed into larger allied craft. The armory of both boat and boat driver were so the boat could ultimately reach its final attacking destination. Shinyo boats were captured in the Philippines. These helmets had a complicated body Armour system. They were evaluated by the US army in '45. The helmets themselves are of an extremely complex and heavy nature and are beautifully made. The main helmet being approx. 2mm thick and this itself being a possible half millimetre thicker than standard Japanese helmets. Upon the front is an extra 3-4mm plate with beveled edges invisibly riveted to the exterior to the shell. A unique spray painted anchor device is found upon the front in yellow with a fine red edging. Each shell is numbered and sometimes as here marked with a triangle arsenal designation stamp. The chin strap system differs to the standard Japanese helmet being all sewn in place and of heavier tie cords. The liner system is of typical mid to late war navy construction having rough out pads and the liners appear to be exactly the same as type 90 liners, often showing minor adjustment for re fitting to these helmets. At present we only know of approx. 5-7 of these helmets in existence.