Actually, model year '86 was the first year for the 420SEL in the US; the M-B website only has full specs back to '88, so I do not have official confirmation that the pre-'88 cars (i.e., '86 and '87 models)had ABS, but I would suspect they did.

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'98 C43 AMG
'88 420SEL
'93 190E Limited Edition (including factory Sportline package)