Top 5 most valuable single stamps in the world

It seems that one of the most interesting subjects in the world of philately is the value of rare stamps. Many articles have been written on the subject, including one by our own company president in 2007, entitled, What are the most famous rare and valuable stamps? However, since then, a few new sales and records have been made. This article lists the 5 most valuable single stamp issues in the world according to the latest research we could find.

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