World's most valuable stamp weighed - USD 71 billion per kilo!

World's most valuable stamp weighed - USD 71 billion per kilo! 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 stamp was sold to an anonymous buyer in 1998 for USD 1.9 million. Its weight has been measured to 0.02675 grams (0.0009 ounces), which gives the stamp the staggering price of USD 71 billion per kilo (or USD 32.2 billion per lb.). This also makes the stamp the most valuable thing in the world per