The Sells-Floto Circus along with the rest of the American Circus Corporation had been bought by John Ringling in 1929. Here we find a 1931 Sells-Floto poster proclaiming the hallowed Greatest Show on Earth. Was this poetic licence since John Ringling owned them all or did someone overstep their bounds?
Didn't the Clyde Beatty-Cole Bros. Circus try using the Greatest Show on Earth in the early 1960's only to be hit with a lawsuit?