Ninto Sword

Because of the lack of any physical evidence or antique swords from the Sengoku period to the Edo period (16th to 19th century) matching the description of the ninjatō,[1] the history of the weapon can only be reliably chronicled from the 20th century onwards. 1964: The Iga-ryū Ninja Museum in Japan, which houses replicas of the sword, is established.[6] That same year, the swords appeared in Shinobi no Mono Kirigakure Saizō (忍びの者 霧隠才蔵) and Shinobi no Mono Zoku Kirigakure Saizō (忍びの者 続・霧隠才蔵), the 4th and 5th entries in the Japanese jidaigeki movie series Shinobi no Mono, released in theaters in Japan. 1973: Ads selling newly manufactured and imported ninja swords appear in the American magazine Black Belt.[7] 1981: Books containing references to the sword written by Masaaki Hatsumi, the founder of the Bujinkan,[3] and Stephen K. Hayes,[4] an American who studied under Hatsumi in 1975,[8] are published. 1983: The first Hollywood film to feature the ninjatō, Revenge of the Ninja, is released in theaters. 1984: The first American television production to feature these swords, The Master, is broadcast on NBC. Link : https://en.wikipedia.org/wiki/Ninjat%C5%8D