MONACO (1955) Verne*. "Journey to the Center of the Earth"*. Die proof in black signed by the engraver COTTET. Scott No 346, Yvert No 433.
AVAILABLE AT $140
AUSTRIA (1986) Martinswall - Tirol*. Black proof. Scott No 1349, Yvert No 1680.
AVAILABLE AT $20
FRANCE (1979) Wall painting, Niaux cave*. Deluxe sheet. Scott No 1642, Yvert No 2043.
AVAILABLE AT $20
FRANCE (1981) Horse*. Deer*. Deluxe sheet. Precancel. Scott No 1721, Yvert No PRE172. Cave drawings at Font-Le-Gaume.
AVAILABLE AT $12
BELGIUM (1931) Han Grotto*. Postal card (N) with corner illustration.
AVAILABLE AT $20