RUANDA URUNDI (1928) Accounting school. Illustrated postal card (N) of Belgian Congo overprinted for use in Ruanda-Urundi. Sepia photo of school house in Lisala. Card #50 in series of 50. Slight corner crease.
AVAILABLE AT $60
FRANCE (1938) Cash registers. PTT letter (Cheques Postales) with ad on reverse for various cash registers and equipment.
AVAILABLE AT $25
U.S.A. (1950) Ruler. Camel. One cent postal card (N) with advertising: "Arguto Oilless Bearing Co."
AVAILABLE AT $25
FRANCE (1950) Lazare Carnot. Hand-colored die proof. Carnot was Napoleon's Minister of War and also an engineer who published works on calculus and geometry. Scott No B251, Yvert No 869.
AVAILABLE AT $250
FRANCE (2001) Fermat. Equations. Die proof in black signed by the engraver LAVERGNE. Scott No 2836, Yvert No 3420.
AVAILABLE AT $140
FRANCE (1958) Urbain Le Verrier. Die proof in black signed by the engraver DECARIS. Le Verrier discovered the planet Neptune by theoretical calculations and also held a position as administrator of tobacco. Scott No 870, Yvert No 1147.
FRANCE (1975) Atom diagram* and waves. Meter Convention Document. Scott No 1435. Yvert No 1844. Centenary of International Meter Convention. Deluxe Sheet.
FRANCE (1996) René Descartes. Bloc gommé. Scott No 2512, Yvert No 2995.