That's not a good way to tell whether a weapon is a sword.
These are also swords, right. They look like swords.
Wrong, those are biscuits.
This is definitely a sword. It has a sword size handle and sheath.
Nope, it's a short blade.
None of that matters because this is a wooden cane.
Wrong again. It's a sword.
I provided 3 examples of weapons that are different than what they appeared to be. Just because GB weapon might look like a black blade doesn't mean it is a black blade.