Nate Sanders auction house in Los Angeles is selling the award. The auction ends Thursday, June 28, at 5 p.m. PT.
The award is not going on sale without a little controversy. In 1950, the Academy of Motion Picture Arts and Sciences created a policy that bans winners from selling their Oscars to anyone but the academy itself.
But "Casablanca" pre-dates that agreement. The film, which starred Humphrey Bogart and Ingrid Bergman, also won oscars for Best Screenplay and Best Picture back in 1943.