He formed Buick and Sherwood (1884), manufacturers of plumbing equipment. He began making gasoline engines and formed the Buick Manufacturing Company (1902); its automobiles were the first to have windshields and a valve-in-head engine. The company failed and in 1903 merged with another to form the Buick Motor Car Company, which built only 53 cars in two years at no profit. Buick left in 1906, pursued oil and gold mining interests, and died an impoverished clerk at a Detroit trade school. DS, one page both sides, 10.5 x 8.25, Buick Oil Company letterhead, May 2, 1911. Ornate stock certificate for 200 shares of Buick Oil Company to Ludwig F. C. Haas, nicely signed “D. D. Buick,” as president. In fine condition, with two vertical folds. COA John Reznikoff/PSA/DNA and R&R COA.