The term kyugunto (kanji: 旧軍刀) means "old military sword" in English. It is written きゅうぐんとう in hiragana. It may also be rendered in English as kyuuguntou , kyūguntoū , kyu-gunto , kyū-guntō , kyuu-guntou , kyu gunto , kyū guntō or kyuu guntou. It's pronounced roughly like "cue goon toe".
This was the original gunto, produced from the Meiji Era (1868-1912) until the mid-1930s (the early Showa Era which lasted from 1926 to 1989). Also known as kyugata gunto (旧型軍刀, きゅうがたぐんとう), which adds the kanji 型, kata, meaning “model” or “style.”
旧, kyu, is used to refer to things that are outdated or replaced by something else: for example, kyusei, 旧姓, “maiden name,” or kyukenpo, 旧憲法, literally old constitution (colloquial term for the Meiji Constitution).
There is another kanji for old, which is 古, ko. This is reserved for things that are physically old and worn, or (in the case of food) stale. The kanji 刀 means “sword” and is pronounced katana by itself.