FRANCE-Deluxe proof (1950) Buffon. Epreuve de luxe. Yvert No 856. Scott No B241. Naturaliste, auteur de l'Histoire naturelle en 40 volumes! (ImageA)

FRANCE-Artist proof (1957) Newton. Die proof in black signed by the engraver MUNIER. Scott No 861, Yvert No 1136. (ImageA)

FRANCE-Deluxe proof (1966) Fontenelle. Scientists. Globe. Die proof in biolet signed by the engraver GANDON. 300th anniversary of Academy of Science. Scott No 1159, Yvert No 1487. (ImageA)

NEW CALEDONIA-Imperforate (1974) Science center. Imperforate corner block of 4. Scott No C110, Yvert No PA153. (ImageA)

U.S.A.-Letter (1978) Stanford University Logo. Envelope with cachet of Siple Station, Antarctica Magnetospheric Research Group, signed by Medical Officer. Cancelation of US Navy FPO. (ImageA)

FRANCE-Deluxe proof (1978) Claude Bernard. Deluxe sheet. Scott No B510, Yvert No 1990a. First defined homeostasis and suggested blind experimentational methods. (ImageA)

FRANCE-Artist proof (1981) Micro-organism in evolution* under microscope. Die proof in black signed by the engraver BEQUET marked 'ep. d'état.' . Scott No 1724, Yvert No 2127. (ImageA)

MONACO-Artwork (1987) Isaac Newton. Formula for gravity. Original artwork, pencil on posterboard 32 x 24 cm (could be trimmed to 26 x 19 cm to include only the design and signature), signed by the artist JUMELET. Scott No 1801. (ImageA)

AUSTRIA-Proof (1992) Paul Kitaibel. Black proof. Famous botanist. Scott No 1562, Yvert No 1885. (ImageA)

FRANCE-Deluxe proof (1994) Formula for wave properties of matter. Bloc gommé. Scott No 2420, Yvert No 2879. Louis de Broglie. (ImageA)

NEW CALEDONIA-Deluxe proof (1994) Microscope* examining Earth. Images flowing through computer screen. Deluxe sheet. Scott No C268, Yvert No PA325. ORSTOM 50th anniversary. (ImageA)

FRANCE-Deluxe proof (1997) Participatory innovation. Bloc gommé. Scott No 2553, Yvert No 3043. (ImageA)

AUSTRIA-Proof (1999) Draftsman's tools. Books. Black proof. Austrian patent office. Scott No 1781. (ImageA)

AUSTRIA-Proof (2015) Joseph Hardtmuth. Black print. First mass-produced cheap pencils. (ImageA)