Buick Series 40 Cabriolet, 1934, by Tüscher. A one-off version of the Buick Special by the Swiss coachbuilder. In 1933 Tüscher had opened an assembly hall for convertible car bodies so it's likely the Buick was made there. The coachbuilder was established in 1909 by Otto and Fritz Tüscher and still exists today building of coachworks for busses.