Two "Norh Polar Amundsen Expedition Air Mail"-labels with one US 2 cent and one 3 cent on envelope, cancelled with the private "North Star Air Post" in blue/green. In upper left corner "Maudexpedition" and signatures from "Roald Amundsen", the US President "Warren G. Harding" and Hubert Work (who was the US Postmaster General). The addressee's name on the envelope is "Hon. Warren G. Harding, President of United States".