This is a beautiful sheet of 6 stamps, issued by Guinea-Bissau in 2009, honoring Nobel Prize winners from 1901. Featured famous personalities include German physicist Wilhelm Röntgen, French economist & Peace Prize winner Frédéric Passy, French poet & Nobel Prize in Literature winner Sully Prudhomme, Dutch chemist Jacobus Henricus van 't Hoff, and German physiologist & Nobel Prize in Physiology or Medicine recipient Emil Adolf von Behring. The sheet is Post Office fresh, mint never hinged, and F/VF.