I vaguely recall the 1964-65 World's Fair in Flushing Meadows, Queens. But I do sorely miss my mold-a-rama Make Your Own Sinclair Dinosaurs. It was quite magical watching your 25 cent dinosaur being created as you watched. I couldn't get enough of the Futurama exhibit sponsored by General Motors, either. I came across this mailer for the Official World's Fair Balloon. Being a nostalgic type I couldn't pass it up.