I could only find stamps from two countries with an 'X' in their name so had to extend my search as you will see.
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Mexico - 26 October 1963 100th Anniversary of the Red Cross |
Maybe that cross in not an X but it was the nearest I could get.
Searching for names with an X in them led me to Brazil.
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Brazil - 1954 Luis Alves del Lima e Silva Duke of Caxias |
The Duke earned the 'title' of Peacemaker, and his birthday became the date on which Brazil honours its soldiers.
In 1969 Denmark commemorated the 100th anniversary of writer -
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Denmark - 28 August 1969 Martin Andersen Nexo |
But the nearest I could get to an X on a stamp was provided by the 700th anniversary of the Fall of the Dannebrog from Heaven.
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Denmark - 12 June 1969 |
The Dannebrog, the Flag of the Danes, is believed to be one of the oldest flags in the world. You may read about the history of the flag and the legend behind it at The History_of_the_Flag where you will find the X waving at you.
To see how others have solved the X-word puzzles cross over to the links at Sunday-Stamps-II-162.