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Map Series1926-1927New, elongated stamps were introduced in 1926 to help postal clerks distinguish Air Mail from regular mail at a glance. They were also issued in new denominations, to comply with revised postal rates. Now for 10%u00a2, you could send a letter weighing up to one ounce, as far as 1,000 miles, with the cost being 15%u00a2 for letters traveling further. In 1927 the maximum weight for a 10%u00a2 stamp was lowered to 1/2 ounce, and a 20%u00a2 stamp was introduced for one-ounce letters.Map of the U.S. & Two PlanesC7%u2014February 13, 1926Map of the U.S. & Two PlanesC8%u2014September 18, 1926Map of the U.S. & Two PlanesC9%u2014January 25, 1927
