This is a beautiful sheet of 6 stamps, issued by Guinea in 2011, commemorating the 300th anniversary of the birth of famous Russian polymath, scientist, and writer Mikhail Lomonosov. Also featured on the sheet are Philipp University of Marburg in Germany, 17th century chemist & physicist Robert Boyle, the "Father of Modern Chemistry" Antoine Lavoisier, Lomonosov's discoveries on the atmosphere of the planet Venus, the Russian Academy of Sciences, and the Russian Minister of Education Ivan Shuvalov. The sheet is Michel catalog #8339-44, and is Post Office fresh, mint never hinged, and F/VF.