RUANDA URUNDI-Entire (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. (ImageA)

FRANCE-Entire (1938) Cash registers. PTT letter (Cheques Postales) with ad on reverse for various cash registers and equipment. (ImageA)

U.S.A.-Entire (1950) Ruler. Camel. One cent postal card (N) with advertising: 'Arguto Oilless Bearing Co.' (ImageA)

FRANCE-Artist proof (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. (ImageA)

FRANCE-Artist proof (2001) Fermat. Equations. Die proof in black signed by the engraver LAVERGNE. Scott No 2836, Yvert No 3420. (ImageA)