SIERRA LEONE 1933 Wilberforce ½d, 1d, 1½d, SG168/70Sierra Leone 1933 Wilberforce d green, 1d black and brown and 1d chestnut, each in a complete folded sheet of 60 (6x10), SG168 70. The sheets are fine and fresh unmounted mint with full original gum. As normal with such large sheets, there are the odd bends and marginal separation, A very attractive set and unusual to find in this form. The 1933 stamp issue marked the Centenary of the Abolition of Slavery and of the death of William Wilberforce. The d