Here you go, pictures of all four of the generations of Studio Display:
(Click to see bigger picture.)
The one in that ad is the 'original' one, complete with multi-color logo and old DA-15 video connector. In my photo, it's the one sitting turned off in front (mine is dead. It powers up, but the backlight is out, and it doesn't display a picture.)
The second generation is the Blue and White (middle in my picture,) which switches Apple's old DA-15 for a conventional VGA, and gives it the B&W treatment, but is otherwise the same. (Still uses ADB, for example, and has S-Video and composite in.)
The third generation is the Graphite (right in my picture,) which moves to DVI and USB. It no longer has S-Video and composite, DVI is it.
Finally, we have the lucite models (left in my picture,) with ADC. (Although the very first revision of the 22" Cinema Display did use DVI.)
By the time the lucite ADC models died, the lineup was officially "Cinema Display", not "Studio Display". (And on the lucite models, only the square-ish aspect ratio 15" and 17" models were "Studio", plus the B&W and Graphite CRTs; the widescreen lucite models were also "Cinema Display".)