SG 748b 1967 4d. strip of four with error on right stamp, ‘new blue omitted’. SUM.

1967 Queen Elizabeth II British Paintings.  4d. rose-red, lemon, brown, black, new blue and gold.  South East corner horizontal strip of four.  Error on right stamp, ‘new blue omitted’.  Superb unmounted mint condition.  Brandon Certificate No. 40,108 (2009).  (With photo showing position on the sheet).  THIS IS THE UNIQUE POSITIONAL EXAMPLE OF THIS ERROR OF WHICH ONLY 5 EXAMPLES EXIST.