Cancellation cover Commemorating the World Chess Championship rematch of 1963

Author: Tigran Vartanovich Petrosian (1929-1984) and Mikhail Moiseyevich Botvinnik signedYear: 1963Publisher: USSR Chess FederationPlace: MoscowDescription:One sheet cover with cancelled stamp and decorative chess board in black on beige paper. Commemorative cancel to stamp. Signed by both players, Tigran Petrosian in red ink and Mikhail Botvinnik in blue ink, dated by Botvinnik 22 May 1963. Stamped in Moscow.Event covers are decorated, stamped and canceled commemorative envelopes. They are created to celebrate an event or note an anniversary. The design (called a "cachet") is generally placed on the left side of the envelope (although there are also "all over" cachets). It explains what is being commemorated on what date, and some times includes an illustration page. Ideally, the stamps used relate to the celebration. Cancels are either obtained in the city of the event. If a special cancellation (one with a design) has been created for the event, you can generally only receive that c