ARGENTINA (1964) UPU emblem*. Trial color proof pair. 15th UPU Congress. Scott No C93, Yvert No PA98.
AVAILABLE AT $25
UNITED NATIONS (1974) Posthorn*. Set of 6 imperforate progressive proof pairs. Scott No 246, Yvert No 239. UPU Centenary. From the UN printer archives. Rare!
AVAILABLE AT $100
NEW CALEDONIA (1974) UPU emblem*. Trial color proof in turquoise blue. UPU Centenary. Scott No C119, Yvert No PA159. Hard to find!
AVAILABLE AT $40
MONACO (1970) UPU Building*. Emblem*. Trial color proofs in strip of 5 with multicolor. New UPU building in Bern. Colors are different from final stamp! Scott No 771, Yvert No 827. Scarce!
AVAILABLE AT $75
FRENCH POLYNESIA (1974) Polynesian woman*. Trial color proof strip of 3. Scott No 284, Yvert No 103.
AVAILABLE AT $120
FRENCH POLYNESIA (1974) Polynesian woman*. Trial color margin proof. Scott No 284, Yvert No 103.
AVAILABLE AT $50
FRANCE (1949) UPU Allegory*. Trial color proof in light blue. Scott No 636, Yvert No 852.
AVAILABLE AT $80
MONACO (1963) UPU emblem*. Dog*. Horse Carriage*. Scott No 541. Yvert No 615. Centennial of first conference in Paris. Trial Color Plate Proofs, strip of five with multicolor. **. Beautiful!
AVAILABLE AT $200
MONACO (1963) UPU Allegory*. Full sheet of trial color proofs. Centenary of 1st International Postal Conference. Scott No 541, Yvert No 615.
AVAILABLE AT $325
FRENCH POLYNESIA (1975) UPU Day*. Full sheet of 25 trial color proofs. Scott No C121, Yvert No PA97. Spectacular!
AVAILABLE AT $325
MONACO (1989) UPU Emblem*. Buildings*. Trial color proofs in strip of 5. Scott No 1698, Yvert No 1702.
AVAILABLE AT $80