This is a Japanese Imperial marine mounted sword. This type of sword is known as Nihon-toh or Katana in Japanese. According to the markings found on the tang(Nakago) which is under the handle(Tuska), this sword was made in April of 1944. The craftsman(Katana shokunin) is Takamasa. The real name of Takamasa is 安田 芳太郎 which Google translator states is Yasuda Yoshitaro. The sword was brought to the U.S. by PFC. John P. Nieuzytek whose commanding officer at the time was 1st Lt. Thomas C. Finnie of the 66th Engineer Topographic Company(see the bring back paper below). I purchased the katana from Stewarts Military Antiques in Mesa Arizona on April 2nd 2004. When I received this item the handle had already been removed. The entire package included the sword, scabbard(Saya) and bringback paper.
Please accept my apologies as I am working on the text for this page.