I have noticed a difference in my 67's original (read as assemblyline version from a 67 S.J.) and replacement, Service Replacement (read as New Old Stock Ford) and current reproduction FoMoCo, oval logo lenses. As typical, my observations see the reproduction versions closely resemble the Service Replacements.
Take note of the images below, assemblyline version from my 67 S.J. (cloudy lens) has the rectangular boss around the screw hole while the reproduction version (clear lens) you cannot hardly notice anything more than a round boss around the screw hole.
Has anyone else picked up on this nuance for other 64-1/2 thru 69 when Ford switched over to the thicker lens?