The buyer is Arthur K.M. Woo, a doctor who would reveal nothing more about himself.
He paid $431,250 for the 90-cent stamp, against a pre-sale estimate of $300,000 to $400,000, including the buyer's premium.
The so-called Ice House Cover with Lincoln's likeness is on an envelope mailed from Boston to an ice house in India in 1873.
The stamp vanished from its owner's safe in Indianapolis and turned up in 2006 at a home in Chicago. A collector notified police.
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