. The Certificate stated that the stamp was "unused" but the traces of an obliteration are definitely present." /> used 4d. black, used, Die B, even margins all round, left corner underinked, with trace of an obliteration; fine and extremely rare. R.P.S. Certificate (1953), number 39,004, not present, stated<I> "that it is a genuine black impression and watermark, but there is no real evidence at present that any 4d. black stamp was issued for postal use"</I>. The Certificate stated that the stamp was "unused" but the traces of an obliteration are definitely present. | Christie's