The Type 135 was launched at the 1935 Paris Salon, and would prove to be Delahaye's mainstay for the rest of its lifetime. The 135 was given a new chassis, designed by engineer Jean-Francois, with welded box-section side members and pressed cross member welded to a ribbed floor. Power was from an overhead valve 3557cc six-cylinder unit sourced from the earlier Type 135. The transverse leaf spring independent front suspension was also carried over.
Coachbuilder P.J. Pennock & Zonen was established in 1898 and would become one of the largest coachbuilders in the Netherlands. They built both bespoke bodies for the individual clients and series-built styles like convertibles.
This car was delivered new to the United States. The Pennock-bodied cabriolet was re-sold to Mr. Dale McCauley of Grosse Point, Michigan in 1952 and would remain in his possession until 1997, when it was sold to a Midwest collector. While in this collection, the car was given a restoration. In 2002, it changed hands again, and soon after given a mechanical and cosmetic refinement. A new convertible top and headliner were installed, and all the interior woodwork was refinished. Many of the mechanical and electrical systems were refurbished, and seat belts were fitted at this time.
The car completed the Pebble Beach Tour d'Elegance in 2003, followed by display at that year's Concours d'elegance, receiving a second-in-class. It was shown at the 2003 Palos Verdes Concours where it also showed well.
The car is finished in dark green and tan, with tan leather on the seats and doors, accented by green piping. The top is a matching tan canvas.
In 2010, this Delahaye 135M Cabriolet was offered for sale at RM Auctions 'Automobiles of Amelia Island' sale in Amelia Island, Florida. The car was estimated to sell for $200,000 - $250,000. As bidding came to a close, the car has been sold for the sum of $220,000, inclusive of buyer's premium.