unused Block of Four -- 1947 (Dec.) "3 PIES" on ½a. black and violet with surcharge double, one inverted, a block of four, [3] showing error "PIE" for "PIES" in inverted surcharge, with part original gum; some tropicalisation nevertheless a scarce block. B.P.A. Certificate (1955). S.G. O33a, ab; £295+