Crosby was so superstitious about hexing his Pirates that he and Kathryn listened to the game with their friends Charles and Nonie de Limur in Paris.

“We were in this beautiful apartment, listening on shortwave, and when it got close Bing opened a bottle of Scotch and was tapping it against the mantel,” Kathryn Crosby said. “When Mazeroski hit the home run, he tapped it hard; the Scotch flew into the fireplace and started a conflagration. I was screaming and Nonie said, ‘It’s very nice to celebrate things, but couldn’t we be more restrained?’ ”

After Crosby viewed the 2-hour-36-minute game, probably in a screening room in the house, the films took their place in the vault, said Robert Bader, vice president for marketing and production for Bing Crosby Enterprises.

They remained there undisturbed until December, when Bader was culling videotapes of Crosby’s TV specials for a DVD release  part of the estate’s goal of resurrecting his body of work.

He spotted two reels lying horizontally in gray canisters labeled “1960 World Series.” They were stacked close to the ceiling with home movies and sports instructional films. An hour or so later, he found three others on other shelves. Intrigued, he screened the 16-millimeter film on a projector. It was Game 7, called by the Yankees’ Mel Allen and the Pirates’ Bob Prince  the complete NBC broadcast. The film had not degraded and has been transferred to DVD.

“I had to be the only person to have seen it in 50 years,” Bader said. “It was just pure luck.”

Bader’s call to M.L.B. officials last spring initiated months of talks that have led to an agreement allowing the MLB Network to televise the game in December, and to wrap interviews and other programming around it, with Bob Costas as the host. M.L.B. also plans to sell DVDs of the game.

“It’s a time capsule,” Trotta said.

Hearing of the broadcast’s discovery, Jim Reisler, a historian born in Pittsburgh, sounded stunned.