SG 142a 1950 6d. Block of 4. Overprint double. Used.

Gibraltar  1950 King George VI New Constitution.  6d. carmine and grey-violet.  South East corner Plate block of four.  Cancelled with ‘REGISTERED 1 AU 50 GIBRALTAR’ circular date stamps.  Variety, ‘Overprint double on all four stamps)’.  KGVI Expertising Certificate No. 1061/03-09 (2009).  THIS IS THE UNIQUE POSITIONAL MULTIPLE FROM THE SINGLE SHEET THAT WAS CANCELLED AT GIBRALTAR (THE VARIETY OCCURRED ON ONLY 4 SHEETS – THE OTHER 3 SHEETS WERE NOT CANCELLED).