CAMEROUN-Imperforate (1972) Chemical lab apparatus. Imperforate corner block of 4. President Ahidjo Prize. Scott No 545, Yvert No 525. (ImageA)

FRANCE-Deluxe proof (1986) Moissan. Chemical formula. Laboratory glassware. Deluxe sheet. Moissan discovered many of the properties of fluorine compounds. He was also the first to produce artificial diamonds. Scott No B576, Yvert No 2397.Interesting! (ImageA)

FRANCE-Deluxe proof (1986) Heroult. Aluminum. Deluxe sheet. Heroult, along with Hall, discovered the process for refining aluminum. Scott No B579, Yvert No 2400. (ImageA)

NEW CALEDONIA-Deluxe proof (1993) Distillation of attar from Niaouli flowers. Deluxe sheet. Scott No C243, Yvert No PA297. (ImageA)

FRANCE-Artist proof (2005) Henri Moissan. Stage die proof in sepia signed by the engraver BEAUJARD. Scott No 3257, Yvert No 3915. Winner of Nobel Prize for his work with fluorine. (ImageA)