These are shown in gray scale so as not to bias the viewer...
On the left is the typical profile of the most common CD 113's .. the colored ones.. yes, even aqua! ;-)
In 1941 (?) they reworked the mold to save a little on glass, and thinned it down slightly. I tried to highlight these differences in profile in red.
[This is the first picture ever posted in the PicturePoster, and for some reason, it didn't even have a description so I added this in April 2010]