What kind of sword is it Kikuchiyo holding in Seven Samurai?

[Prince of China]

Damn! It's so huge!
I first I heard it was the Naginata but now I think it's the Tachi Long Sword. Why must I know? I have a huge interest in swords!Swords!SWORDS!

 

[fizzlephox]

It's not an actual sword it was made for the movie and its huge proportions are only equal to a European Hydropheliner Diamond Edge Baker's Skillet Sword +9 vs Tredoslop and Doug Lombardi since no one likes him.

 

[Yakuza]

I believe its a Nodachi sword.

Great movie too.