A rare 8-millimeter film taken by a Texas businessman shows President John F. Kennedy’s limousine speeding to a hospital shortly after the president was shot in Dallas in 1963. And the film, which only a few people have ever seen and which shows a secret service agent desperately trying to assistant the president and Jacqueline Kennedy, is being auctioned off in Boston at RR Auction later this month, the NYT reports.

RR Auction has more on the sale here.