UNITED NATIONS (1964) Education for Progress. Set of 4 imperforate progressive proof blocks of 4. Scott No 134, Yvert No 130. From the UN printer archives. Rare!
AVAILABLE AT $150
UNITED NATIONS (1988) Woman writing on blackboard*. Set of 5 imperforate progressive proofs. Scott No 524. International Volunteer Day. Ffrom the UN printer archives. Rare!
AVAILABLE AT $50
UNITED NATIONS (1992) UN University Building, Tokyo. Set of 6 imperforate progressive proofs. Scott No 615, Yvert No 618. From the UN printer archives. Rare!
AVAILABLE AT $50
LAOS (1959) Key of Knowledge*. Globe*. Trial color proofs in strip of 5. Scott No 58, Yvert No 61.
AVAILABLE AT $75