SG Spec. W151-W153 var. 1969 Concorde set in blocks of 4. IMPRIMATURS. SUM.

Great Britain  1969 Queen Elizabeth II First Flight of Concorde.  Blocks of four.  IMPERFORATE IMPRIMATURS FROM THE NATIONAL POSTAL MUSEUM.  Handstamped ‘NP Imprimatur’ on reverse.  Superb unmounted mint condition.  British Philatelic Association Certificate No. 73,817 (2009).  EXCEPTIONALLY RARE.