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Along with rare and valuable stamp items from the 19th century, the Alexander collection also keeps modern items that provide an interesting look at postal activity in the middle of the 20th century. A postcard sent from the plane during a transatlantic flight is an example of a special postal service provided by the airlines to passengers as part of the flight experience.

On January 16, 1971, the Sultanate of Oman Post Office issued its first stamps. The stamps were issued by adding an overprint on Muscat and Oman stamps.