This is a beautiful sheet of 6 stamps, issued by Guinea-Bissau in 2009, honoring Nobel Prize winners from 1906. Featured famous personalities include British physicist J. J. Thomson, French chemist Henri Moissan, Nobel Prize in Physiology or Medicine recipients Camillo Golgi & Santiago Ramón y Cajal, Italian poet & the first Italian to win the Nobel Prize in Literature award Giosuè Carducci, and former United States President & Nobel Peace Prize recipient Theodore Roosevelt. The sheet is Michel catalog #4242-7, and is Post Office fresh, mint never hinged, and F/VF.