In 2014, French auctioneer Marc Labarbe received a phone call from a friend. The attic of their Toulouse home had yielded a surprising discovery: a painting, coated in dust and stained by a water leak, that looked all the same to be something of value. Labarbe approached gingerly, cleaning one of the painted faces with cotton wool and water. He sent a photo to the art appraiser Eric Turquin, based in Paris, and then he waited.


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