It is uncertain exactly when the Yankees began referring to themselves by their popular nickname. By the time of Babe Ruth's arrival in 1920, the "Yankees" nickname was well established, but the name still did not appear on the uniforms. In fact, the Yankees have seldom carried their nickname on their uniforms. The only time was during 1927–1930, when the word "YANKEES" first appeared, in lieu of "NEW YORK" – on the "road" shirts. This was continued through the 1930 season, and then "NEW YORK" was restored to the road uniforms. (Okkonen) The name must have been considered 'official' at least by 1923, when the team named its new ballpark Yankee Stadium.