This is a beautiful sheet of 4 stamps, issued by Guinea in 2011, as part of the History of Art series, depicting Prehistoric Art. Featured are Marcelino Sanz de Sautuola, owner of the Altamira cave, where much prehistoric art was discovered, and archaeologist Henri Breuil. The sheet is Michel catalog #8758-61, and is Post Office fresh, mint never hinged, and F/VF. .