Great Britain/USA joint cover - Centenary of Powered Flight illustrated with Concorde and Wright Brothers plane.
USA 37c stamp issued 2003 for the Centenary of Wright Brothers first flight at Kittyhawk NC 'Wright Brothers Station' postmark
Great Britain 1st class gold cancelled with commemorative postmark of Elmdon Birmingham showing Concorde and the Wright Brothers' plane
Both dated 17 December 2003.
Covers exclusive to us - only 10 of these covers exist.