SG 87, 87b 1950 1½d. block of 4. Error, ‘St. Edward’s Crown in watermark’. SUM.

St. Kitt-Nevis  1950 King George VI Tercentenary of British Settlement of Anguilla.  1½d. orange.  Block of four.  Variety on top right stamp, ‘St. Edward’s Crown in watermark’.  Superb unmounted mint condition.  VERY RARE.