The postal block shows a portrait of D. I. Mendeleev, Periodic table of chemical elements of D. I. Mendeleev, reference scales of the company "Nemetz" (1895) and Druse of rock crystal from the collection of minerals of D. I. Mendeleev. Margin note: 2019 is the international year of the Periodic table of chemical elements.
The post block with overprint will be implemented as part of the art cover.
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