The letter is not simply a later commemorative tribute to Expedition 1

Before permanent habitation

Certificate of authenticity

delivering David Wolf to the station and returning Michael Foale to Earth

Soyuz TM-32 FLOWN ISS cover Dennis Tito first space tourist Gene Cernan The letter is not simplySoyuz TM 32 Extremely Rare ISS Flown Dennis Tito Cover, One of Only Four Produced An exceptional artifact from a defining moment in commercial spaceflight: an International Space Station flown cover carried aboard Soyuz TM 32, hand signed by the mission crew and postmarked in orbit on May 6, 2001. The reverse bears a handwritten certification by Yuri Usachev, commander of the resident ISS Expedition 2 crew, confirming that the cover was flown aboard