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A day after the declaration of the State of Israel, the Egyptian army crossed the border line of the Sinai Peninsula and invaded the territory of the Land of Israel. The Egyptian force moved along two main axes, one along the coast and the other towards the Hebron mountains with the aim of subduing the newly founded state of Israel. An envelope preserved in the Alexander collection testifies to the Egyptian preparation for war and the fate of the invading army.

During the Spanish-American War, the American army took control of Puerto Rico. The flight of Spanish government officials, including postal officials, led to a shortage of postage stamps in many of the island’s post offices. The mayor of Cuomo, who had to deal with the problem, issued on August 14, 1898, with the approval of the American commander, a temporary postage stamp for the use of the city’s residents.

The Philatelic Service is careful to consult with the authorized authorities regarding the inscription that should appear on the stamp, but despite careful research, a situation may arise in which incorrect, or "timely" information finds its place on the stamp.

Stamps in which the face value appears twice, in two different currencies. Such stamps were issued in countries that were in the midst of a currency exchange process, and chose to indicate on the stamp the face value according to both the old and new currency.

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.