In 1901, a prototype and two production units of the diamond framed Indian Single were successfully designed, built and tested. The first Indian motorcycles, having chain drives and streamlined styling, were sold to the public in 1902. In 1903, Indian's co-founder and chief engineer Oscar Hedstrom set the world motorcycle speed record of 56 mph. In 1904 the company introduced the deep red color that would become Indian's trademark. Annual production of Indian motorcycles then exceeded 500, rising to a peak of 32,000 in 1913. The engines of the Indian Single were built by the Aurora Firm in Illinois under license from the Hendee Mfg. Co. until 1906.