Envelope with Waupun National Air Week. This envelope was mailed on May 20, 1938. It was mailed to Postmaster, Ridgewood, N. J. It is a day of issue with a large National Air Mail Week stamp. The Dates of the National Air Mail Week are May 15-21. The stamp shows a badger, with the state of Wisconsin logo "Foreward." It also has Waupun and Wisconsin. The stamp is for 6 cents.
