Rare vintage 2.5 x 4.75-inch tan card with decoratively trimmed corner tips, boldly signed in blue ballpoint pen, adding Betty Boop's signature line "Boop boop a doo," acquired in-person by a busy New York City-based autograph hound in the early 1950s. In good condition, with two punch-holes to the left edge, not affecting the writing. Adorable, squeaky-voiced singing and occasional film star Helen Kane made wildly popular records of "Get Out and Get Under the Moon" (1928), "That's My Weakness Now" (1928), "I Wanna Be Loved By You" (1928), "Is There Anything Wrong with That?" (1928), "Don't Be Like That" (1928), "Me and the Man in the Moon" (1928), "Button Up Your Overcoat" (1929), "Do Something" (1929), "I'd Do Anything for You" (1929), "He's So Unusual" (1929), "Aint'cha?" (1929), and "Dangerous Nan McGrew" (1930). Mae Questel's dead-on impersonation of Kane was used by Max Fleischer Studios as the voice for Betty Boop in 1930s, as was her euphemism for lovemaking, "boop-boop-a-do."

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