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It's a second-hand sport scar (Egyptian Cross) bought by a sentimental Ellery who had it accustomed for personal use (Siamese Twin). It uses Goodyear tires and has a side lamp, it's horn gave a loud uncomfortable sound which could easily have woken the death (Siamese Twin).

When investigating the Siamese twin mystery the Queens reside in an country house where their car is put in the garage. At the end of the story the mansion is struck once again by fire.

...a booming explosion. "The gasoline in the garage," muttered the Inspector. "There go the cars"

But neither father nor son seem to panic and in the next story (Spanish Cape) it reappears undamaged. It is but years later we see a changed Ellery drive a fast Cadillac (Vanishing Corpse).

In The Finishing Stroke the Duesenberg reappears. Ellery's car was serviced in a garage situated in West 87th street. He had American snow chains installed. 

It al began in 1913, when German-American brothers Fred and Augie Duesenberg founded Duesenberg Motors Company, Inc. on University Avenue in St. Paul, Minnesota, to build engines and race cars. The brothers were self-taught engineers and built many experimental cars. Duesenberg cars were considered some of the best cars of the time, the first to use an eight-cylinder in-line engine.

The Duesenberg J was the Bugatti Veyron of its day, costing as much as $19,000 at a time when the average physician earned $3,000 per year and the most expensive Ford Model A sold for around $1,200.

The Duesenberg’s inline eight-cylinder engine made over 265 horsepower, which was good enough to give the impressively-sized roadster a top speed of nearly 120 mph.

Duesenberg ceased production in 1937, although at least two more cars were built following the company's demise. During and after World War II, there was so little interest in the brand that used Duesenbergs could be purchased for as little as a few hundred dollars, which makes us wonder what the $3 million car of the future will be.