The Buick Series 90 produced between 1931 and 1935 is recognized by the CCCA as a full classic, the only complete model (as opposed to individual custom bodies) to enjoy that status. The year 1931 was also the first to see the production of Buick’s new Straight Eight engine, a 345 CI inline-8 producing 104 horsepower. The new engine arrived just as the inline-6 it replaced was coming to the peak of its development, and with competitors moving to larger displacements and more cylinders, its arrival seemed well-timed, but the Depression was in full bloom and sales dropped to fourth place; Buick sold just 843 of its Series 90 Roadsters, discontinuing the model at the end of that year.
(description text adapted from https://www.rmw.lv/car/en/91-club-sedan)
