UNITED NATIONS NEW YORK OFFICES 1977 25c Fight against Racial Discrimination IMPERF PLATE PROOFS, Scott 288Pl, superb never hinged mint lower left corner BLOCK of 4 with UN emblem in the margin, with inked fingerprints on the reverse as a security devise, very fresh & scarce. (4 proofs)

UNITED NATIONS NEW YORK OFFICES 1986 22c International Piece Year PROGRESSIVE COLOUR IMPERF PROOFS BLOCKS of 4 complete set, Scott 475PP, superb never hinged mint, plus IMPERF PLATE PROOFS BLOCK of 4, Scott 475Pl, superb never hinged mint, with inked fingerprints on the reverse as security device. Very fresh & scarce, only 50 of each produced. (5 blocks = 20 proofs)