DAHOMEY (1966) Turret*. Die proof in brown signed by the engraver PHEULPIN. International Negro Arts Festival. Scott No 216, Yvert No 236.
AVAILABLE AT $80
FRANCE (1973) Tower - Toulouse*. Die proof in black signed by the engraver DURRENS. Scott No 1378, Yvert No 1763. Philatelic Congress.
AVAILABLE AT $140
FRANCE (1982) Montlhery Tower*. Die proof in black signed by the engraver DURRENS. Scott No 1816, Yvert No PRE176. Only 23 exist. Rare!
AVAILABLE AT $80
MOROCCO (1933) Tower of Hassan in Rabat*. Die proof in brown with value tablet empty. Scott type AP2.
AVAILABLE AT $120