1957 (09) Parliament - IPU Conference Cover - Six Pence Airmail Stamp - Conference 'Big Ben' H/S

Highly unusual IPU Conference Cover - Six Pence Airmail Stamp (cut off an Airmail Letter and stuck to the cover) - Conference 'Big Ben' H/S.

Not seen this version before.............

The 'Big Ben' H/S is cat £100 on any cover.........

Code: 57896