Meito

Meito are renowned swords heralded for both their rarity and sheer fighting capabilities. There are currently an unspecified number of these swords looming the seas; over the course of the last fifty years, they have been traded amongst several various persons and their glory has attributed to many swordsmen. The swords are further distributed into four different categories regarding their power, with there being at least 12 Saijo O Wazamono Grade Swords (the highest tier) and 50 Ryo Wazamono Grade Swords (the third highest tier).

Trivia

 * Though there are many named swords in the One Piece world, many of which fall into the katana grades, only a few of them have been mentioned so far as "meito" when introduced.