The crew face off in an auction challenge in the fourth-season opener.

Source: Discovery Channel

Items include a pit-crew suit from the movie "Talladega Nights;" a custom-built hydroplane speedboat; and a guitar labeled "Bigsby."

Source: Discovery Channel

A 1930s book filled with autographs from Hollywood celebrities is auctioned off. Also: The Garretts gamble on a 1930s gas pump and fire alarm; Paul tests out a vintage lie detector.

Source: Discovery Channel

Items include an oversize M16 training rifle; a vintage Vendorama pen dispenser; and a Victorian chair.

Source: Discovery Channel

Buckets filled with sterling silver and a seaman's locker from the USS Yorktown are auctioned off.

Source: Discovery Channel

Items include a desk that allegedly belonged to Thomas Jefferson; and an antique horse-racing game.

Source: Discovery Channel

Items include a British knife from WWI; an opium-tax stamp; and a Swiss Army motorcycle.

Source: Discovery Channel

Items include a rare 1956 Mustang Pony motorcycle; a "Star Wars" stormtrooper costume; and an air-raid siren.

Source: Discovery Channel

Items include a Dodge Viper; a saddle that was allegedly commissioned by a king; and a pair of drive-in-movie speakers.

Source: Discovery Channel

Paul puts the Gallery 63 bronze horses up for sale; rare letters from Norman Rockwell and Helen Keller; German U-boat telescope.

Source: Discovery Channel

Jon journeys to pick up an antique telephone; Paul takes in paintings by legendary sports artist, Leroy Neiman; a motorcycle modified by Michael Jordan's racing team.

Source: Discovery Channel

Items include a Mercedes-Benz that belonged to Sugar Ray Leonard; a dive suit from World War II; and a map of the United States made out of license plates.

Source: Discovery Channel

A 1930s book filled with autographs from Hollywood celebrities is auctioned off. Also: The Garretts gamble on a 1930s gas pump and fire alarm; Paul tests out a vintage lie detector.

Source: Discovery Channel

Items include a cape signed by Evel Knievel; an antique Heberlein violin; and a vintage phone booth.

Source: Discovery Channel

Country musician Clay Walker auctions off personal items for charity.

Source: Discovery Channel

Items include a haberdashery; an exercise machine; and a vintage Gulf Oil drum.

Source: Discovery Channel

Items include a rare Pannonia motorcycle; a printer from the '30s; and a sales award that belonged to Michael Jackson.

Source: Discovery Channel

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