That's exactly as mine appears. There is no stop on the pedal itself. The stop is simply the piston returning against the circlip or snap ring (visible when the rubber bellows are lifted). The pushrod adjustment the Haynes manual refers to is by way of an eccentric where the pushrod attaches to the pedal. Mine (a '90 model) does not have this and agrees entirely with the description you have given. Presumably this was a design change that occured around '84. That clears up that mystery. Now just for my problem and my diagnosis.
107.023: 350SLC, 3-speed auto, icon gold, parchment MBtex (sold 2012 after 29 years ownership).
107.026: 500SLC, 4-speed auto, thistle green, green velour.
124.090: 300TE, 4-speed auto, arctic white, cream-beige MBtex.
201.028: 190E 2.3 Sportline, 5-speed manual, arctic white, blue leather.
201.028: 190E 2.3, 4-speed auto, blue-black, grey MBtex.
201.034: 190E 2.3-16, 5-speed manual, blue-black, black leather.