used Block of Four THE FAMOUS BLOCK OF FOUR CONSISTING OF THE ERROR SE-TENANT WITH THREE 1D. VERMILION, BRIGHT SHADE WITH A HINT OF CARMINE, CLEAR MARGINS ON THREE SIDES AND ON PART OF THE FOURTH SIDE, THE ERROR SLIGHTLY CUT-INTO, FAIRLY LIGHT CANCELLATIONS; THE BLOCK WITH SMALL STAINS, CREASE AND TEAR; A GREAT RARITY. R.P.S. CERTIFICATE (1925)