Sotheby’s is being sued by a furious art collector who claims the famed auction house is reneging on a deal to buy back his $1.5 million painting — that could be a fake.

Financier Charles Cahn, says the top auction house sold him the work —”Portrait de Leopold Zborowski” attributed to Italian painter and sculptor Amedeo Modigliani — in 2003, but later learned that the piece may have been inauthentic.

To assuage the likely irate customer, Sotheby’s penned a deal with Cahn agreeing to put his painting back up for auction if he ever wanted to sell it before 2031, according to the suit filed last week in Manhattan Supreme Court.

“Sotheby’s has failed to accept consignment, to sell the painting at auction, and to pay Cahn the amount owed,” states the suit — which seeks $2.6 million in damage

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