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(CNN) - The Oscar statue Orson Welles won for "Citizen Kane" 70 years ago goes on sale in an online auction this month.

Welles was 25 when he wrote, directed and starred in "Citizen Kane."

It was nominated for nine Oscars in 1941, but only took home Best Screenplay.

Welles shared the credit with a co-writer.
The L.A. auction house behind the auction would not identify the seller, although the statue was known to be in the hands of the actor's youngest daughter.

It says an attempt to sell it at auction in 2007 failed to draw a buyer.

The Academy of Motion Picture Arts and Sciences, which opposes selling the trophies, has said Welles' Oscar is worth at least $1 million.