1957 (09) Parliamentary Conference - Conference Air Mail Letter - 'Big Ben' H/S - Then Doubled with a 2015 Magna Carta 1st Class

Highly unusual Parliamentary Conference Air Mail Letter with the Air Mail 6d Red nicely cancelled by the 'Big Ben' H/S.

Then this has been doubled with a 2015 Magna Carta 1st Class stamp - highly relevant and missed by near enough everyone else !

Code: 67421