Last month at a dig site in Japan in an old tomb researches found a bronze mirror in the shape of a shield, on top of it was a sword that was 7' 10" long made of iron. Along side a 13' long coffin. Researches say that the sword was made for ceremonial purposes or for use in the after life fighting demons. It is in a curved shaped, a Dako or serpentine shape. The coffin has yet to be opened but it is speculated that it contains the remains of a normal sized person and contains his treasures. 

Not much information on it yet but this is the largest and oldest sword to ever be found intact in Japan.  I guess i should add that the site is from the 4th century. 

Not sure if i can put up a link but a quick search of "7 foot 10 inch sword found in Japan" brings up a few dozen articles. 

Here is the link to one of the articles: http://www.thehistoryblog.com/page/3

GNM

Thanks George. I am kind of gun shy about posting links.