ZAMBIA 1966 W.H.O. 3d error, SG116aZambia 1966 W. H. O. 3d, error gold omitted (including country name 'ZAMBIA'), SG116a. Issued in respect of the inauguration of the W. H. O. new headquarters in Geneva. The stamp features the W. H. O. building and UN flag. A pristine unmounted mint example with full original gum. A spectacular error and seldom ever seen on the market available to purchase. Looks decidedly under valued in the Stanley Gibbons catalogue considering how appealing an error