KEY POINTS:
Orson Welles' 1941 Oscar for Citizen Kane, considered one of the greatest movies of all time, will go on the auction block in December.
The Academy Award for Best Screenplay is expected to sell for an estimated US$800,000 to US$1.2 million, Sotheby's auction house.
The golden statuette, believed to have been once lost by Welles himself, resurfaced in 1994, and after an extended legal battle was returned to his estate.
In 2003, it was acquired by the Dax Foundation, a Los Angeles-based charity. The proceeds will help fund the organisation's worldwide efforts.
