A great 1950's piece....MYSTERY KNIFE.  Marked only with "USA".  My guess is that this was made by Colonial but please use your best jusdgement.  Cigar type shape.
 
No cracks or chips in the handles.  Both blades fold out as they should.  Good snap left.  No wobble.  Some signs of use on blades.
 
3 1/2" total length when closed.
 
Location D2-8