The New York Yankees logo was originally designed by Tiffany & Co!

The insignia was first created back in 1877 by Louis B. Tiffany of the famous jeweler, Tiffany & Co. The symbol was first struck on a medal that was awarded by the New York City Police Department to the first NYC policeman shot in the line of duty - Officer John McDowell. Thirty-two years later the design was repurposed by the Yankees, then known as the “New York Highlanders”. The logo was adopted in order to compete with the orange NY symbol used by the rival New York Giants ballclub. The New York press soon began to use the "Yankees" nickname in coverage of the Highlanders’ games and in 1913 the nickname became official. The logo has remained virtually unchanged to this day and is now one of the most recognizable symbols in all of sport.

You can learn more fun facts about the Yankees logo at the Yankees website.