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Sometimes, the envelopes in the Alexander collection were affixed with stamps that are interesting in their own right, and not just as representing the payment for the shipment. One of the items kept in the collection is an example of the technical errors that were involved in the printing of the stamps used during the British Mandate period, and illustrates the way in which these errors help to locate the original position of the stamp in the complete stamp sheet.
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On August 11, 1914, the French Post Office issued its first charity stamp. The proceeds from the sale of the stamp were donated to the Red Cross. The stamp was prepared by adding an overprint on a definitive stamp from 1906.
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The natural world includes prominent and familiar elements, such as the colorful rainbow that adorns the sky after rain. There is no one who is not familiar with the rainbow, but it turns out that many are not familiar with the order of the colored stripes that make it up.
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A term for an error that occurred during the printing of a stamp that was printed in two colors in two separate passes. After the first stage was printed in one color, the sheet was accidentally fed into the printing press upside down, resulting in the central image being printed upside down relative to the frame.

An envelope sent on the island of Trinidad documents an attempt by the local charity to collect donations for the Red Cross during World War I. The course of events turned this activity into a philatelic curiosity.