ANTIQUE AND FROM AN ESTATE SALE.  I would date this one to the late 1800's to early 1900's.  1890-1920.
 
Larger pocket knife with wood handle.  Single blade.  Marked "Kaufmann Solingen".
 
4 3/8" long when closed.  No cracks of chips in either handle.  No wobble.  Open and closed as it should.  No snap left.  Locks open.
 
Location E2