First Open Air Post Office In United States

Front:
912 FIRST OPEN AIR POST OFFICE IN UNITED STATES, ST. PETERSBURG, FLORIDA

Back:
E-6151 St. Petersburg's post office represents the in- itial open air post office in the country. It is located at Fourth St. and First Avenue North close by Williams Park. Distributed by Hartman Litho Sales Company, Largo, Florida Made by Eastern Photo Litho Company, Lowell, Massachusetts