East African Currency Board, a uniface obverse and reverse plate colour die proof for 10 shillings, no date (series of 1964), green, sailboat on Lake Victoria, the reverse shows a coffee plant with berries and other flowers, similar to the issued design, (Pick 46pp, TBB B232pp), Plate Colour Green No. 17 and 6.1.64 , printed at lower margin, n PCGS holders 55 and 63, previously mounted and extremely rare (1 pair)