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A few days after the occupation of Jerusalem by British military forces, the opportunity arose for the residents of the city to return and send letters to their relatives in Europe. The British military authorities allowed civilians to use the military postal services and send letters for free until the civilian postal systems were organized. An envelope preserved in the Alexander collection indicates that the information about the generous arrangement was not properly published among the postal services in Europe, which led to the imposition of fines without taking into account the special situation that prevailed in the Land of Israel.
On December 28, 1929, El Salvador Post issued its first airmail stamp. The stamp was issued by adding an overprint to an existing stamp.
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