unused Block of Four -- 4c. on 18c. black and pale brown, a lower right corner block of four with the top right stamp showing variety "FOUR CENTS." and bar 1½mm. below normal position, unused with large part original gum; a few very minor tone spots, mainly in the selvedge. A very scarce positional block. R.P.S. Certificate (1971). S.G. 146c, #350+. Photo