first U.S. firm to win an award for excellence in silverware at the Exposition Universelle in Paris. In 1868, Tiffany was incorporated. "Gilded Age" In 1870, the company built a new store building at 15 Union Square West, Manhattan, which was designed by John Kellum and cost $500,000. It was described by The New York Times as a "palace of jewels." Tiffany stayed at this site until 1906. In 1877, an insignia that would become the New York Yankees "NY" logo was struck on a police medal of honor by Tiffany; the Yankees adopted the logo in 1909. In 1878, Tiffany won the gold medal for jewelry and a grand prize for silverware at the Paris Exposition. In 1879, Tiffany purchased one of the world's largest yellow diamonds which became known as the Tiffany Diamond. The Tiffany Diamond has only been worn by four people, one of whom was Audrey Hepburn for the promotion of Breakfast at Tiffany's. In 1887, Tiffany bought a number of pieces at the auction of part of the French Crown Jewels, which attracted publicity and further solidified the Tiffany brand's association with high-quality diamonds. The company revised the Great Seal of the United States in 1885. 20th century In 1902, after the death of Charles Lewis Tiffany, his son, Louis Comfort Tiffany, became the company's first official design director. In 1905, the Manhattan flagship store was relocated to the corner of 37th Street and Fifth Avenue, where it would remain for 35 years. In 1919, the company made a revision to the Medal of Honor on behalf of the United States Department of the Navy. This "Tiffany Cross" version was rare because it was awarded only for combat, using the previous design for non-combat awards. In 1942, the Navy established the Tiffany version for non-combat heroism as well but, in August 1942, the Navy subsequently eliminated the Tiffany Cross and the two-medal system. The company moved its flagship store to its present-day 727 Fifth Avenue building in 1940; the building was designed by Cross & Cross. In 1956, legendary designer Jean Schlumberger joined Tiffany, and Andy Warhol collaborated with the company to create Tiffany holiday cards (circa 1956–1962). In 1968, Lady Bird Johnson, First Lady of the U.S. at the time, commissioned Tiffany to design a White House china-service that featured 90 flowers. In November 1978, Tiffany & Co. was sold to Avon Products, Inc