The image was made at Pitt Stadium on a Sunday afternoon in autumn of 1964. New York Giants quarterback Y.A. Tittle had just been the recipient of a ferocious hit by Steelers defensive end John Baker. Tittle was 38 years old — ancient, by football standards. He was one of the NFL’s best quarterbacks. But the moment this picture was made, Tittle’s career was nearing a painful conclusion. “That was the end of my dream,” he’d later say.