US$14,259.30 Harley Davidson 1945 45 cubic-Inch, 750cc.Harley-Davidson's first flathead V-twin appeared in 1929 as the Model D. Its 45-cubic-inch engine was smaller than the company's existing 61- and 74-cubic-inch F-head V-twins, which then became known as "Big Twins."The latter switched to a flathead design the following year, but those larger engines were neither as reliable nor as long-lived as the under stressed "Forty-five."Though the Forty-five was no powerhouse, it proved to be a versatile engine that remained in production for more than four decades.During that time it served duty not only in street motorcycles, but also in three-wheeled Servi-Cars (1933-1973), military WLAs of the 1940s, and WR racing bikes of the 1940s and 1950s.It's no coincidence that the history of Milwaukee-based Harley-Davidson, founded in 1903, parallels that of the 20th Century, the American Century.Racers and cops, soldiers and stars, lawyers and loners, all seem to have found themselves on a Harley.Harley-Davidson began producing the 45” 750cc in small numbers in 1940, as part of a general military expansion.The later entry of the United States into World War II saw significantly increased production, with over 90,000 being produced during the war (along with spare parts the equivalent of many more).Harley Davidson would also produce a close WLA 45” variant for the Canadian Army called the WLC and would also supply smaller numbers to the UK, South Africa, and other allies, as well as filling orders for different models from the Navy and Marine Corps.Many WLAs would be shipped to allies under the Lend-Lease program. The largest recipient was the Soviet Union, which was sold over 30,000 WLAs.Production of the WLA would cease after the war, but would be revived for the Korean War during the years 1949 to 1952.Most WLAs in western hands after the war would be sold as surplus...