This Vengeance Prototype is one of five Larry made as a prototype for his new VooDoo model in 2003. Automatic opening by pressing the edge of the scale. Manual opening is very easy due to the scooped bolsters which make both thumbstuds readily accessible. When open the notches on the belly of the tang at the liner lockup further enhance the index finger grip. File notched thumb rest. Smooth and impressive. Certificate of Origin included.