This is a beautiful sheet of 5 stamps, issued by Guinea-Bissau in 2009, honoring Nobel Prize winners from 1913. Featured famous personalities shown include Dutch physicist Heike Kamerlingh Onnes, Swedish chemist & founder of the award Alfred Nobel, French physiologist Charles Robert Richet, Swiss chemist Alfred Werner, Bengali polymath Rabindranath Tagore, and President of the International Peace Bureau Henri La Fontaine. The sheet is Michel catalog #4527-31, and is Post Office fresh, mint never hinged, and F/VF.