A great 1950's piece....MYSTERY KNIFE.  Marked only with "USA" and "HIGH CARBON STEEL".
 
PLEASE BE SURE TO TAKE A GOOD LOOK AT THE HADLE MATERIAL!! BEAUTIFUL SEMI TRANSPARENT MARBLED TYPE....BEAUTIFUL!
 
Some signs of age as seen in pictures.  No cracks or chips in the handles.  Both blades fold out as they should.  The larger blade has really good snap...the smaller has a small amount of snap left.
 
2 3/4" total length when closed.
 
Location E2