Star Trek: Nemesis (2002), Shinzon Bloodletting FX Knife

original prop weapons

Two-pronged Reman knife used by Praetor Shinzon to draw his own blood, allowing Picard and the Enterprise crew to confirm his identity. Distinctively discolored metal blade, purple metal handle with bronze mesh wrap, concealed rubber squeeze bulb and copper tube extending to the tip of the weapon. Based on the Gil Hibben Double Shadow knife.

From Propworx, with It's A Wrap COA.