Attributed to Ub Iwerks. Two 9.5x12" animation sheets have lead pencil image area w/figure of Mickey shown waist up w/arms fully extended and mallets in air. First image is 4” long w/number “135” in corner and closed smile. Second image is 3.5” long w/number “262” in corner and open smile w/eyes closed. Both are from scene six minutes into the cartoon where he used these mallets to play bull's teeth. Sheets have lt. margin aging, image areas clean and Exc. Nice images from sequence. Released on Nov. 18, 1928, “Steamboat Willie” was the third of Mickey's cartoons to be produced, but was the first to be distributed and the first to be shown more than once in a theater. It is historically recognized as the first cartoon to feature a fully post-produced soundtrack. Clean and tight historical drawings.