Lot 59 - RAINBOW TRIAL - 1d DEEP BLUE STRIP OF FOUR ENDORSED BY EDWIN HILL:1d deep blue Rainbow Trial strip of four from the foot of the pane on white plain wove paper in blue with a mixture of Prussiate of Potash and Chinese White in the ink (Spec DP 20b). A superb strip from the foot of the pane of twelve with margins on three sides. Endorsed at foot by Edwin Hill "F 1/2 Pruss & 1/2 Chi blue plain". Exceptional. Ex D Rowse and illustrated on page 136 of his book "Rainbow Trials"..... Sold for GBP 4,000