Michael Keaton's Batman costume and dinosaurs from the Jurassic Park movies are to go under the hammer with the first-ever Irving G. Thalberg memorial Oscar at the 31st Profiles In History Hollywood memorabilia auction. The $4 million (GBP2 million) Los Angeles auction, which takes place on 27 and 28 March (08), also features a rare King Kong six-sheet movie poster - one of only three known to exist - and Charles Middleton's Ming The Merciless cape from 1936 movie classic Flash Gordon. The Batman costume is expected to be the auction's highlight, and is estimated to fetch between $60,000 (GBP30,000) and $80,000 (GBP40,000). Meanwhile, the Thalberg Oscar producer Darryl F. Zanuck won in 1938 is set to be one of the auction's high-priced items. To this day, the Thalberg Memorial Award is the rarest and most prestigious honour bestowed by the Academy. It is only given an average of once every other year. There have only been 36 recipients, and the accolade has not been bestowed on anyone since 2000, when movie mogul Dino De Laurentiis was honoured.