The 770 was substantially revised in 1938, resulting in the new internal designation of W150.
The all-new chassis was made with oval section tubes and was suspended from coil springs all around, with independent suspension at front and a de Dion axle at the rear.
Hydraulic brakes were fitted, compared to the servo-assisted mechanical brakes of the prior series.

The engine had the same basic architecture as that of the W07, but had been tuned to produce 155 bhp (116 kW) at 3000 rpm without supercharging and 230 bhp (172 kW) at 3200 rpm with.
The transmission now had five forward ratios with a direct fourth gear and an overdrive fifth.
Top speed was around 170 km/h (106 mph).
A twin-supercharged 400 hp (298 kW) model was available, able to reach a top speed of around 190 km/h (118 mph).
 A total of five were made.

In 1938, the huge W150 was understood to have been the most expensive German passenger car for sale up to that time, though it appeared on no price list: the price was published merely as auf Anfrage ("upon request").
Eighty-eight W150-series cars were built before chassis production ended in 1943.
The last cars were bodied and delivered in March 1944.

Some cars of this model were offered by Hitler as gifts to his allies, namely: Marshal Ion Antonescu of Romania, Benito Mussolini of Italy, Francisco Franco of Spain, Marshal Carl Gustaf Emil Mannerheim of Finland and Emil Hácha of the Bohemian Protectorate.
Marshal Antonescu's car, for instance, was bulletproof.
The 770 was substantially revised in 1938, resulting in the new internal designation of W150. The all-new chassis was made with oval section tubes and was suspended from coil springs all around, with independent suspension at front and a de Dion axle at the rear. Hydraulic brakes were fitted, compared to the servo-assisted mechanical brakes of the prior series.
The engine had the same basic architecture as that of the W07, but had been tuned to produce 155 bhp (116 kW) at 3000 rpm without supercharging and 230 bhp (172 kW) at 3200 rpm with. The transmission now had five forward ratios with a direct fourth gear and an overdrive fifth. Top speed was around 170 km/h (106 mph). A twin-supercharged 400 hp (298 kW) model was available, able to reach a top speed of around 190 km/h (118 mph).  A total of five were made. 
In 1938, the huge W150 was understood to have been the most expensive German passenger car for sale up to that time, though it appeared on no price list: the price was published merely as auf Anfrage ("upon request"). Eighty-eight W150-series cars were built before chassis production ended in 1943. The last cars were bodied and delivered in March 1944.
Some cars of this model were offered by Hitler as gifts to his allies, namely: Marshal Ion Antonescu of Romania, Benito Mussolini of Italy, Francisco Franco of Spain, Marshal Carl Gustaf Emil Mannerheim of Finland and Emil Hácha of the Bohemian Protectorate. Marshal Antonescu's car, for instance, was bulletproof.
Mercedes-Benz 770