This is a list of the most expensive cars sold in auto auctions through the traditional bidding process, consisting of those that attracted headline grabbing publicity, mainly for the high price their new owners have paid. A 1963 Ferrari 250 GT/O serial number 3851GT sold at Bonham's Quail Auction on August 14, 2014 for US $34,650,000.00 ($38,115,000.00 including buyers premium). A 1954 Mercedes-Benz race car sold for a record $30 million at an auction in England on July 12, 2013. While collectible cars have been sold privately for more, this is the highest price ever paid for a car at a public auction. The record was previously held by a 1957 Ferrari Testa Rossa Prototype which sold at an auction in California in 2011 for $16.4 million. The Mercedes W196R Formula 1 race car, powered by a 2.5-litre 8-cylinder engine, was one of a group of race cars that won 9 World Championship-qualifying Grand Prix races in 1954 and '55. The previous record was $16,390,000 for a 1957 Ferrari 250 Testa Rossa, sold on August 21, 2011 in an auction hosted by Gooding & Company in Pebble Beach Equestrian Center, the site of the Pebble Beach Concours d'Elegance in Pebble Beach, California, United States.