WATCH: John F. Kennedy assassination footage never seen before goes up for auction

Newly discovered film footage of John F. Kennedy's assassination in Dallas on November 22, 1963 is now up for auction by Boston-based RR Auction.

The extraordinary and previously unknown 8mm color footage shows President John F. Kennedy's motorcade speeding down a Dallas freeway towards Parkland Memorial Hospital after he was shot on November 22, 1963.

The silent footage shows the motorcade traveling through downtown Dallas, capturing segments of the motorcade passing through the city prior to its arrival in Dealey Plaza, followed by a remarkable post-shooting clip of Kennedy's presidential limousine speeding along North Stemmons Freeway en route to the hospital.

According to RR Auction, while several still photos and home movies of JFK's Dallas motorcade are known—the most famous being Abraham Zapruder's film, shot on similar 8mm silent color home-movie stock—very little exists that documents the aftermath of the shooting or the race to Parkland Hospital.

Prior to the discovery of this film, the only known imagery of Kennedy's limousine on North Stemmons Freeway were three still photographs, also captured by spectators along the route. There were no reporters or press photographers stationed on the freeway, since the quick drive north to the Trade Mart, where Kennedy was to give an address, was not supposed to be a newsworthy event.

The cameraman, a truck driver named Dale Carpenter, Sr., initially missed his shot of the presidential limousine and the film opens in a different location earlier on the motorcade route, one car behind Kennedy's, with the Presidential Secret Service Follow-Up Car, carrying Secret Service Agent Clint Hill, and the Vice Presidential Car in frame. 

Carpenter remained in place to capture much of the rest of the motorcade, and all together, this initial footage amounts to about 40 seconds, while the footage from North Stemmons Freeway lasts just over 10 seconds.

Having missed his initial opportunity to capture footage of President Kennedy, he made his way up to North Stemmons Freeway to capture a glimpse. The motorcade's intended route had been well publicized, published locally in the Dallas Times Herald and Dallas Morning News, and the parade's plodding pace gave Carpenter ample time to relocate. Standing on the thin shoulder of the freeway's edge, he managed to capture the only known film footage of the motorcade during its dash to Parkland Memorial Hospital, where the president would be pronounced dead.

The seller of the footage is Carpenter's grandson. Sale of the physical film is intended to include all of seller's copyright ownership and interest in the film subject to an existing non-exclusive licensing agreement that expires March 5, 2025 and permits use of a small portion of the film in 'Agent Number Nine', a documentary feature about Secret Service Agent Clint Hill, which is expected to premiere in 2025.

The Remarkable Rarities auction from RR Auction begins with online bidding on September 4, followed by a live auction in Boston on September 28. The live auction will begin Saturday, September 28th at 1:00PM EST in Boston, MA.

For more information, please visit www.rrauction.com.