A 1961 Ferrari 250 SWB California Spider is among more than 60 rare classic cars from the Baillon collection that were recently discovered in a barn in France.
It's set to feature in a February 6 sale at Artcurial in Paris with an estimate of $11.6m-14.7m.
The lot starred in the 1964 film Les Felins, featuring Jane Fonda and Alan Delon.
John Collins, a spokesperson for Ferrari dealership Talacrest, commented: "'I have known about the car for years and I was gutted when I found out about three weeks ago that an auction house had got it.
"Apart from a few people, not many knew the Ferrari still existed. It is a phenomenal car and the best barn find in more than 20 years.
"I am sure it will go for an eight-figure sum and I will be one of several people looking to buy it. It is really great - people are going to be fighting over it."
Roger Baillon, a wealthy French entrepreneur, built up the stunning collection during the 1950s. A series of financial setbacks in the 1970s forced him to sell of a large portion of it, while the rest were forgotten.
The lot also includes one of only three surviving examples of a Maserati A6G Gran Sport, which is valued at $1.5m.
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