The Japanese sword is world famous for being superior in sharpness and beauty. It has even become a collector’s item to have one hanging inside one’s home. The history of the Japanese sword is so long and colorful. It spans wars and battles, different periods in Japan, and survives as a thing of beauty today.
In the ancient times, the Japanese sword was a double edged straight blade. That soon changed to a single edged slightly curved blade, and then to a fully curved blade.