Lot 51133 – 1960 QEII Kariba Hydro-Electric Scheme 3d blackish green and red-orange in mint nh complete sheet of 60 with ERROR RED-ORANGE OMITTED in the 4th column

1960 QEII Kariba Hydro-Electric Scheme 3d blackish green and red-orange in mint nh complete sheet of 60 with ERROR RED-ORANGE OMITTED in the 4th column, and partly omitted in the 3rd and 5th columns, folded into quarters with some perf. splitting, two normal stamps with tone spots on reverse, a spectacular modern error of the British Empire, the unique sheet containing 6 of the 24 known examples that exist, cert. Murray Payne