Jul 31, 2014, 4:18pm ET

Historian claims $64M Ferrari GTO is a replica

Seller asks for record price, but authenticity now in doubt.

A rare 1962 Ferrari GTO is currently up for sale for a record price, however at least one expert claims it's a replica.

Listed for 47.6 million euros (~$63.7 million USD) on Mobile.de, a German site owned by eBay, the GTO would easily raise the bar for classic Ferrari prices after a 1963 example of the same model sold last year for the equivalent of $52 million.

Ferrari historian and expert Marcel Massini claims to have tracked provenance for all 39 of the genuine 250 GTOs that were ever produced, and the vehicle offered for sale online is not among them.

"I can tell you that with 100 percent certainty," Massini told CNBC. "I know where all of these cars are today. And this is not one of the original GTOs."

The owner's choice to sell the car online, rather than via an auction house that would certify its history, is also cited as evidence of a scam.

If Massini is correct, the replica may be a notable side-effect of a collectible-car niche that some say has reached absurd prices in recent years. Some analysts expect a price collapse, though the dire prediction has yet to come true as values continue to climb.