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The need for the soldiers to maintain contact with their families during war has often presented a difficult challenge to the military authorities. Receiving and sending mail was recognized as a first-class means of maintaining the morale of the soldiers, and great efforts were made to ensure the continuity of the operation of the military mail. During the First World War, the military authorities were faced for the first time with the need to deliver millions of pieces of mail all over the world, and one of the solutions they found was the development of a special postcard containing short, pre-printed messages, from which the soldier could choose the appropriate message. A number of postcards kept in the Alexander collection represent messages delivered by British army soldiers from the front in Israel.

On July 1, 1967, the Italian Post Office issued a series of four stamps designed to promote the use of postal codes among the general public.

The initial idea for issuing stamps is in some cases the starting point of a turbulent journey during which decisions are made that stem from the worldview of the parties participating in the decision-making process, and pressures from various groups in the population.
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A stamp whose use was limited to sending letters within the borders of the issuing country. These are usually stamps that did not have the face value printed in the local currency, or stamps issued in countries where, according to the local currency system, there was a difference between a "hard" currency used for international trade and another currency used within the country.

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.