Good old pocket knife from an estate sale out of Newark Ohio.
 
Made in Chicago Ill.  Marked M. KLEIN & SONS and K.
 
Still has the bail.  Both blades open as they should.  Good snap left at half stop, full open, and close.  No chips or cracks in the scales.  The very end tip of the blade is chipped.  SEE PICTURES.
 
Brown delrin handle  That would date this to the 1950's to 1960's as they stopped using bakelite in the 1940's.
 
3 5/8" long body when closed.
 
Location D2-16