It’s an auctioneer’s jackpot dream. A man walks in off the street, opens a portfolio of drawings, and there, mixed in with the jumble of routine low-value items, is a long-lost work by Leonardo da Vinci.
And that, more or less, is what happened to Thaddée Prate, director of old master pictures at the Tajan auction house here, which is to announce on Monday the discovery of a drawing that a curator at the Metropolitan Museum of Art says is by Leonardo, the Renaissance genius and master draftsman. Tajan values the work at 15 million euros, or about $15.8 million. On Thursday, this reporter was ushered into Tajan’s private viewing room, where the drawing, of the martyred St. Sebastian, about 7½ inches by 5 inches, stood resplendent in an Italian Renaissance gold frame on an old wooden easel.
In March, Mr. Prate recalled being “in a bit of a rush” when a retired doctor visited Tajan with 14 unframed drawings that had been collected by his bibliophile father. (The owner’s name and residence somewhere in “central France” remain a closely guarded secret, at his request.) Mr. Prate spotted a vigorous pen-and-ink study of St. Sebastian tied to a tree, inscribed on the mount “Michelange” (Michelangelo).