Lot 50581 – 1960 Kariba Hydro-Electric Scheme 3d with variety red-orange omitted on two stamps

1960 Kariba Hydro-Electric Scheme 3d with variety red-orange omitted on two stamps in top right corner marginal strip of four, with the fourth stamp showing a partial omission, mint nh, very fine and outstanding positional item of this error, only 24 mint exist, cert. BPA (2009) (SG £12,000+++)(SACC 33b, R300,000+++)