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.
AVAILABLE AT $140
CENTRAL AFRICA (1986) Halley's comet*. Die proof in violet of gold foil stamps. Michel Nos 1247-8.. These proofs were printed in Switzerland and bear the raised imprint "IMPRIMERIE DES TIMBRES POSTES - SUISSE."
AVAILABLE AT $50
GUINEA (1986) Halley's comet*. Die proof in red of gold foil stamps. Unlisted in Scott. Michel Nos 1113-4. These proofs were printed in Switzerland and bear the raised imprint "IMPRIMERIE DES TIMBRES POSTES - SUISSE."
AVAILABLE AT $50