Dag Hammarskj ld Invert
The Dag Hammarskj?ld invert stamp was issued In 1962 by the US Postal Service; one year after the death of Dag Hammarskj?ld, Secretary-General of the United Nations, in an airplane crash. The stamp shows the yellow background inverted relative to the image and text and is also known as the Day's Folly. A total of 40 million of the inverted stamps were printed after the discovery of the error so there would be no rarity factor.
Estimated Price : Commercial Use