GREAT BRITAIN 1969 (VARIETY) 1S6D FIRST FLIGHT OF CONCORDE MISSING SILVER ON FIRST DAY COVER
First Flight of Concorde first day cover with the 1s6d missing silver-grey (leaving the Queen’s head in the underlay blue colour). Very scarce. The only example of the error on cover we're aware of. Fresh and fine. SG786a; SC583a
