UNITED NATIONS NEW YORK OFFICES 1988 50c International Volunteer Day IMPERF PLATE PROOFS PAIR, Scott 525Pl, superb never hinged mint. Very fresh & scarce. (2 proofs)

UNITED NATIONS NEW YORK OFFICES 1988 25c Cycling – Health in Sport IMPERF PLATE PROOFS, Scott 526Pl, superb never hinged mint lower left corner BLOCK of 4 with UN emblems in the margin, with inked fingerprints on the reverse as a security devise, very fresh & scarce, only 50 pairs produced. (4 proofs)