Photo de stock - Preparation for the Treasures of World Philately exhibition in the historic building of the National Museum in Prague, Czech Republic, on December 16, 2020. On the photo is seen one of the exhibits - Four-crown Austro-Hungarian stamp on veined paper with overprint ""Czechoslovak post 1919"". (CTK Photo/Michal Krumphanzl)

Photo de stock: Preparation for the Treasures of World Philately exhibition in the historic building of the National Museum in Prague, Czech Republic, on December 16, 2020.

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