A double-signed Joe Frazier v Muhammad Ali 20th anniversary reunion gala invitation, held in Philadelphia 14th April 1991 to mark the anniversary of t

A double-signed Joe Frazier v Muhammad Ali 20th anniversary reunion gala invitation, held in Philadelphia 14th April 1991 to mark the anniversary of the 'Fight of the Century' at Madison Square Garden 8th March 1971, the inside front cover signed by both boxers in fine black marker pen; sold together with a letter of authenticity signed by Thomas Hauser (2)