In 1922, the new issue of the blue 10-cent U.S. Special Delivery stamp had for the first time the image of a motor cycle, replacing the 9 Dec 1902 version with a bicycle. Being the first new stamp of the Harding presidency, the revised design demonstrated a growing post-World War I interest in developing technology. This stamp began the year's series of new regular postage stamps, collectively having a patriotic theme, and was issued with much more publicity than any previous regular series. The increased level of attention given by the Post Office Department to this series included giving advance notice, and is regarded as the early roots of the later practice of issuing First Day Covers for stamp collectors.«