Questions & Mysteries Have there been no "Graded Blade" created since Ryuma's time?

#1
Were all the Graded Blades in One Piece forged either during or before Ryuma's age? In Thriller Bark, Ryuma himself refers to his Sword as one of the 21 "Great Grade" Blades. Meaning that the number of "Great Grade" blades have not changed since he was alive. Have there been any Graded Blades that were forged since his day?
 
#2
Weapon grade system is a plot hole oda refuses to answer at this point.

We still don't know about Mihawk Blade being 21 or 50 or 12 , and then got turned to black and supreme raising the rank or was always there.

We don't know what grade shusui was before it became black.

Sandai doesn't even classify into 12/21/50
 
#3
Were all the Graded Blades in One Piece forged either during or before Ryuma's age? In Thriller Bark, Ryuma himself refers to his Sword as one of the 21 "Great Grade" Blades. Meaning that the number of "Great Grade" blades have not changed since he was alive. Have there been any Graded Blades that were forged since his day?
Enma and wasp were forged in current one piece times also sandai kitestsu
 
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