You did very well. Low mileage sells, and peole would pay more than that for one on ebay.
That is the most bulletproff of ANY W126 in my opinion. For a diesel it really IS like new., though you may have to catch up with age related things, such as perished rubber and so on.
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1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ...
1995 E 420, 170k "The Red Plum" (sold)
2015 BMW 535i xdrive awd
Stage 1 DINAN, 6k, <----364 hp
1967 Mercury Cougar, 49k
2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive

(sold)