May 9 (Bloomberg) -- J.K. Rowling is one of 13 authors producing a ``storycard'' written on a blank A5 sheet as part of a charity auction in London.

The ``Harry Potter'' writer, plus Richard Ford, Tom Stoppard, Sebastian Faulks, Doris Lessing and Nick Hornby, have all contributed to the sale at a branch of Waterstone's, the bookseller said today.

Proceeds from the June 10 event, called ``What's Your Story?'' will be donated to English PEN and Dyslexia Action, said an e-mailed statement by Waterstone's, which is owned by HMV Group Plc.

``It's impossible to say how much this auction will raise,'' said Gerry Johnson, managing director of Waterstone's, in the statement. ``With the caliber of authors involved, then really the sky is the limit. Owning an original piece of work by a favorite writer is the ultimate limited edition for fans.''

In December 2007, a record auction price of 1.95 million pounds ($3.98 million) was paid by Amazon.com Inc. at a Sotheby's London charity sale for J.K. Rowling's handwritten volume of fairy tales, ``The Tales of Beedle the Bard.''

Waterstone's said the evening auction at its Piccadilly store was inspired by the Royal College of Art's annual sale of more than 2,500 ``secret'' postcards. That event, held in November, attracts crowds of buyers hoping to snap up an original work by Damien Hirst or Grayson Perry for under 50 pounds.

Unlike the Royal College event, the Waterstone's auction will be restricted to an invited audience and bidders will know who created each of the cards.

``It's not going to be an anonymous process,'' said Jane Opoku, account director at the public-relations agency Colman Getty, which issued Waterstone's announcement. Opoku said the auction would be conducted by Sotheby's and that as yet no presale estimates were available.

(Scott Reyburn writes about the art market for Bloomberg News. Any opinions expressed are his own.)

To contact the reporter on this story: Scott Reyburn in London at sreyburn@hotmail.com.

Last Updated: May 8, 2008 20:03 EDT