This is a beautiful sheet of 6 stamps, issued by Guinea-Bissau in 2009, commemorating the 1911 Nobel Prize Laureates. Honored personalities include winner of the Nobel Prize in Physics for his work on heat radiation Wilhelm Wien, Nobel Prize in Chemistry winner Marie Curie, Swedish ophthalmologist & winner of the Nobel Prize in Physiology or Medicine Allvar Gullstrand, Belgian Symbolist playwright & Nobel Prize in Literature laureate Maurice Maeterlinck, and Nobel Peace Prize winners Tobias Michael Carel Asser & Alfred Hermann Fried. The sheet is Michel catalog #4315-20, and is Post Office fresh, mint never hinged, and F/VF. Click here to visit my eBay Store for other auctions and Direct Sale items: