British West Africa, Currency Board, uniface colour trial 20/-, Lagos, 21 July 1930, brown, pale green and pink, palm tree centre, value at left, three printed signatures of Mercer, Flood and Wilson low right (Pick 8ct, TBB B108bt), perforated red SPECIMEN WATERLOW & SONS LIMITED overprint, an attractive Waterlow printing, in PCGS holder 64 very choice new