This would be a fine card of a long-ago aircraft and airline, but what makes it more special is that the message area tells us “FLY BY B.O.A.C., Enjoy British Service at its Highest Level … This is a first day of issue Coronation Stamp Souvenir”.  And so it is, clearly postmarked London on 3 June 1953, with three different stamps showing The Queen.   And the card was directed not to a human, but to the International Monetary Fund in Washington.  That seems a bit clinical, and how the card survived, we’ll never know.  But — Grade: 1