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A mint-condition sheet of 10 stamps portraying Audrey Hepburn, a coy smile on her face and a long, black cigarette holder dangling from her lips, is expected to fetch at least euro400,000 ($564,040) at a charity auction in Berlin.

Auctioneer Andreas Schlegel says he's received interest from four serious bidders. Two-thirds of the money raised will go to the Audrey Hepburn Children's Fund, and one-third to UNICEF Germany.

The Saturday sale will be a profitable outcome for a botched series of 14 million stamps that should have been destroyed. They show the Belgian-born actress in her most famous role as the ebullient Holly Golightly in "Breakfast at Tiffany's."