It was a way for the government to have the public help finance the war effort. Use was encouraged as a way for the public to save money and at the same time contribute to the war effort. The program continued after the Second World War, ending in June 1970.
Smithsonian policy prohibits employees from appraising or placing a value upon any objects.
Many local and university libraries have copies of a stamp catalog that provides prices. Unsealed circulars 3 oz. All U.S., per 1 oz. All U.S., per 1 oz. All U.S., per 1 oz.