East African Currency Board, a uniface obverse and reverse plate colour die proof for 20 shillings, no date (series of 1964), blue, sailboat on Lake Victoria, the reverse shows a coffee plant with berries and other flowers, similar to the issued design, (Pick 47pr, TBB B233pp), Plate Colour No. 22 Blue and 22.11.63 , printed at lower margin, in PCGS holder 61 NEW, previously mounted and extremely rare (1 pair)