This auction is for a genuine XEROX Hawley Mark II Mouse.  This mouse is very similar to the design used on the Xerox ALTO and was used by Symbolics for the 3600 console.  The jacket of the mouse cable is in great condition.  Most of these jackets have flaked away, but this one has not broken down and is still supple.   The cable terminates with an RJ45 which still has its locking clip in good shape.