NIGER (1972) Book*. Tall ship*. Plane*. Set of 2 trial color proof blocks of 4. UNESCO Book Year. Scott Nos 252-3, Yvert Nos 257-8.
AVAILABLE AT $60
FRANCE (1976) Stylised flower*. Trial color proof strip of 3 in different colors. Scott No 2O17, Yvert No SE51.
AVAILABLE AT $50
MONACO (1966) UNESCO 20th anniversary. Trial color proof block of 4. Scott No 642, Yvert No 700.
AVAILABLE AT $50
GABON (1966) Student*. UNESCO emblem*. Trial color proofs in margin strip of 5 with multicolor and printer's color codes penciled in margin. 20th anniversary of UNESCO. Scott No C48, Yvert No PA50. Scarce!
AVAILABLE AT $60
FRANCE (1966) UNESCO*. Trial color proof in brown. Scott No 2O7, Yvert No SE37.
AVAILABLE AT $40
MOROCCO (1958) UNESCO building*. Mohammed V*. Trial color proofs in strip of 5 with multicolor. Scott No 25, Yvert No 386.
AVAILABLE AT $60
NEW CALEDONIA (1966) Dancers*. UNESCO emblem*. Trial color strip of 4. Scott No 347, Yvert No 331.
AVAILABLE AT $50