The noble R129 Mercedes-Benz SL-Class specimen pictured above, a 1998 SL500 (5.0-liter V8, 315 hp), sold for $8300 in early 2016 with 91,000 miles, a thick stack of maintenance receipts going back four years and a clean California history.

As the number of well-kept Mercedes R129s dwindles, and savvy car-shoppers realize how much craftsmanship went into these cars, there’s nowhere for the prices to go but up.

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