Antique Cadillac Parts The first antique Cadillac was completed on October 17, 1902. In January the following year, the Cadillac became the first American automobile manufacturer to win the coveted Dewar Trophy for the standardization of automobile parts. Cadillac did not use the "A" designation in 1903; however, later Cadillac publications combined references to the 1903 "Cadillac" and