Compared to his diamond-covered skull, Damien Hirst's latest work for sale, a bull in formaldehyde, with a head crowned by a solid-gold disc, and hooves and horns cast in 18-karat gold is practically a deal. The Golden Calf will be auctioned off at Sotheby's in New York in September and is estimated to bring in $16 to $24 million. The calf comes in a gold-plated stainless steel and glass box. The monumental piece is part of Beautiful Inside My Head Forever, a major auction of new works by Hirst, on September 15 and 16. The auction will include formaldehyde sculptures, new paintings, new cabinets and preparatory drawings,