Hi KLW,
According to the Marcot book, "Spencer Repeating FireArms," 'In the fall of 1866, Thomas W. Lane, an employee of the Spencer factory in Boston, developed a new cartridge extractor for the seven shot repeater....Lane assigned all rights to his invention to the Spencer Repeating Rifle Company in October, 1866...the new mechanism eventually replaced the blade-type extractor and was put into thousands of Model 1867 and New Model Spencer carbines and rifles....the (Lane) extractor did not fulfill its function as well as expected, so the company returned to a shortened, blade type extractor in 1868.'
Two Flints