Lot 40820 – Luxembourg 1875-78 Official 4c top margin block of 10 with horizontal and diagonal overprints mint

Officials: 1875.78 top margin block of 10 (5 x 2), the middle three stamps of top row with two horizontal OFFICIEL, one towards top, the other at base, heavy hinge reinforcements between third and fourth columns and small thin middle stamp bottom row, a fine and dramatic aspect, heavy hinging on reverse. Only a couple known to exist, signed Demuth and BPB Cert (2003)