The Swedish stamp, The ”Treskilling” Yellow, is the world’s most valuable stamp. Now its exact mass, volume and density are measured for the first time by SP - The Swedish National Testing and Research Institute in Borås, Sweden.
The Republic of Tuva (Tannu Tuva) is located in the Tannu Mountains on the Siberian border in northwestern Mongolia. The first postage stamps were issued in 1926.
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