In the concrete floor of Hall C of the Miami Beach Convention Center, where in 1964 a 22-year-old Cassius Clay “shook the world” and upset a heavily favored Sonny Liston, a bronze medallion commemorating the historic fight was embedded 27 years later.

It was a fabulous dedication ceremony in July 1991 to honor the man, now known as Muhammad Ali, by naming the hall after him. A plaque on the wall was unveiled, a tribute from the city of Miami Beach. Along with it, the bronze disk was put in the ground to mark the spot where the boxing ring from that storied fight had stood.

Now decades after he changed his name upon converting to Islam, after his suspension from boxing because of his objection to serving in the military during Vietnam, and after a comeback from his three-year exile from the sport that solidified an unparalleled legacy as the Greatest, that medallion, about 10 inches in diameter, is gone.