This is a beautiful sheet of 6 stamps issued in 2001 featuring famous personalities of the 20th century. Included on the sheet are Russian astronaut Yuri Gagarin, Nobel Prize-winning physicist and chemist Marie Curie, airship inventor Ferdinand von Zeppelin, father of nuclear physics Ernest Rutherford, astronaut Neil Armstrong, and Nobel Prize-winning physicist Albert Einstein. The sheet is Post Office fresh, mint never hinged.