FRANCE (1952) Poincaré*. Die proof in black signed by the engraver PHEULPIN. Scott No B270, Yvert No 933. Rare!
AVAILABLE AT $140
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