I believe the first AW hubs with the re-designed no-slip driver were produced in the mid-70s, for Columbia, according to the S/A website. Not sure what year this drivetrain became actual practice.

P.S.: Just thought I'd stress this for any newbies who may be reading this thread: call it "neutral" if you wish - but this aspect of the hub design is NOT for intentional use by any means. Rather a design flaw which was curiously not rectified until the near demise of the three-speed design as a popular bicycle of choice in the 80's.

-Kurt