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A knitted sweater once owned by Princess Diana has sold at auction in New York for $1.1 million.

The red woollen jumper is covered by white sheep, with one exception: there's also a single BLACK sheep.

The auctioneers, Sotheby's, had estimated the value at fifty to ninety thousand dollars.

Joanna Osborne is one of the original designers of the jumper -- and it was she who found it.

She's been speaking to Newshour's Tim Franks.

(Photo: Diana, Princess of Wales (1961 - 1997) wearing 'Black sheep' wool jumper by Warm and Wonderful (Muir & Osborne) to Windsor Polo, June 1981. Credit: Tim Graham Photo Library via Getty Images)