Originally Posted by Raven X
didn't the Death Watch in Clone Wars have those cool black "vibro blades?"
maybe Sabine will carry that as a weapon too.
I think there was only one that they stole from the Jedi archives. After the events of Clone Wars, it falls into the possession of Darth Maul. And considering what happened after that, it is probably in the possession of Sidious.
So, no, they weren't standard issue Mandalorian weapons.