For the model years 1967 through 1971, a total of 27 Imperial limousines were produced by Stageway Coachbuilders (ASC) of Fort Smith, Arkansas on a wheelbase, and were justifiably advertised as the largest luxury automobiles in the world. These were the official Imperial Crown models. Armbruster-Stageway was a well-established builder of such customized products as airport limousines, and Chrysler had been collaborating with the firm for years. The last of these were built in 1969, though leftover units were updated with 1970 and 1971 grilles and taillights, and sold during those model years. They closed out the Imperial Custom /Imperial Crown tradition in fine style.