NIGERIA 2007 UPU CONGRESS PROOF PAIR, ONE UNPRINTED
N50 UPU Congress/Ceremonial Costumes vertical proof pair. Top stamp in significantly more vibrant colours compared to issued stamps. Lower stamp unprinted. Scarce. Just 14 such pairs possible. Fresh and fine. Mint never hinged. Offered with normal pair. SG851fvar; SC801Fvar
Note: two proof sheets of 50 were produced each with seven unprinted stamps
