Mercedes-Benz returned to prominence on the international stage at the Frankfurt Auto Show in April of 1951, showing an all-new top-of-the-line luxury car: the W186 Model 300.

Production began in November that year, lasting through three different series until 1962.

Built in both four-door saloon and cabriolet versions, the 300 combined updated, though classic-inspired, styling with modern technology highlighted by an all-new 3.0-liter overhead-camshaft six-cylinder engine, independent four-wheel suspension, an electric dash-operated adjustable torsion bar suspension, and pedal-operated centralized lubricating system.

Referred to as the 300 b, the second series began production during the 1954 model year.

Upgrading to twin dual-barrel downdraft Solex carburetors and increasing engine compression to 7.4:1 boosted horsepower by 10, and vacuum-assisted power brakes and front door vent windows were also added.

In total, 146 300 b Cabriolet Ds were built, with only 59 examples built in...