Courtesy of Bonhams

Derived from the classically elegant 2800/3.0/635CS/CSi series, the BMW M6 coupe is a rare and brilliantly fast grand tourer. The M6 and M6 35CSi were nearly identical in specification but were labeled differently for marketing reasons. The M6 was the second-fastest BMW ever built at 158 mph — only the equally rare high-performance M1 coupe ...

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