UNITED NATIONS NEW YORK OFFICES 1989 25c Tenth Anniv of Offices in Vienna IMPERF PLATE PROOFS PAIR, Scott 552Pl, superb never hinged mint, with inked fingerprints on the reverse as security device. Very fresh & scarce, only 24 pairs produced. (2 proofs)

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)