This Butterfly gets it name from the style of it's blade.  This is a heavy duty butterfly with polished rosewood handles.

This Bankhead  has a lot to offer.  

Heavy duty antique blasted handles with polished rosewood inserts

440 thick stainless missile type blade with wings.  One side is sharp the other side is a false edge. 

Extra Strong handle pins for sturdy quick movement

9 inches long when opened.

Lock on handle to prevent opening in your pocket

Metal pocket clip