1922, black overprint ''Costantinopoli'' on Italian due stamp of 10c orange and magenta, block of four with black control marking in the center, full original uneven gum as always exists, NH or LH (bottom right stamp, block mentioned as NH in the certificate), F/VF, R. de Montbas certificate, Sassone #S1, C.v. €700 as singles, Est. $120-$150...