Agree with Jay, hard to verify without looking at the car, but unless the person buying is someone who is aware of the nuances of w126 SECs. they probably haven't addressed the finer detail.....like rear bulkhead rust, sunroof seals, boot seal, rear light seals, idle speed, steering play, rollbar bushes, battery tray, delaminating windscreens etc etc
On the other hand, the car may have had everything addressed, just about feasible with a full time team on the car.
Shame he has removed the bumper stickers that said 'W. Maurer'.
W. Maurer was the paint outfit who did a lot of the paintjobs for Gemballa. Cars indeed had a white lettering on the back with "W. Maurer, designed by U. Gemballa" on the rear. The bodykit has also been suggested as a special order Zender kit for Gemballa, i.e. Zender kit and further enhanced by Gemballa. Attached is a picture of a Qatari car, identical to this blue one....same wheels, same nose job, same bodykit.
If verified, it's well worth the money, if it's been refurbed correctly.