V8 engine. In its debut year, 3,703 Sixty Specials were delivered, at a base cost of US$2,090 ($ in dollars ) - it was a success in every measure. The new Sixty Special outsold every other Cadillac model in its first year accounting for 39% of all Cadillacs sold. In 1938, aside from the standard 4-door sedan, two prototype models were built on the Sixty Special body - two very dashing four-door convertibles (one owned by GM executive, Larry Fisher, which was demolished by Harley Earl in a traffic accident and one sent to Europe, which was later recalled and consumed by GM Engineering in structural tests in preparation for the 1940 "Torpedo" bodies), plus one Sixty-Special coupe (driven personally for two years by GM President, Bill Knudsen). A not well-received new front end, which was patterned on the Lincoln Zephyr and lacked the visual punch expected by Cadillac buyers, a modest change in trim level, and some new options appeared for Sixty Special in 1939. First among the new options was a retractable metal panel above the front seat called a "Sunshine Turret-Top Roof", a predecessor to the type of sunroof that would not become more commonplace until the mid-1970s. The sliding roof, patented by GM's Ternstedt Hardware division, was unlatched and slid back into a recess built into the rear portion of the main roof where it would lock in place. Second was an optional retractable division glass in between the front and rear seats. This partition did not have a header in the roof, only channels between the door posts for the retractable glass to travel. The 1938 price of $2,090 remained for 1939 as well. More than 5,500 Sixty Specials were built for 1939, accounting for 40% of all Cadillacs sold, but only 280 of them were equipped with the sun roof option (of those 280 sun roof optioned cars, 55 of them were also equipped with the retractable glass partition). Special orders in 1939 included a convertible sedan built on the Sixty Special chassis for Prince Frederik of Denmark. Starting in 1940, and for the remainder of its existence, the Sixty Special would be Fleetwood marketed, enjoying higher-priced molding, trim and upholstery like the Series 75 and 90. Thus it took over the Series 70's place, which was dropped for the 1938 model year, as Cadillac's most luxurious owner-driven large model, a role it would