8.5x11" letterhead sheet and mated 4.25x9.5" mailing cover for 15th annual event Aug. 30-Sept. 2 hosted by Cleveland in 1935 although undated by year. Letterhead is rwb including bluetone photo of stadium packed by spectators. Same photo is repeated on envelope front. Reverse includes rwb official emblem of the annual races plus other cachets on left half, reserving the right half for postal use although unused. Exc.