Some of the first and finest Ferraris ever produced will go on sale at the marque's Maranello factory on May 18. The star of RM Auctions' Ferrari: Leggenda e Passione is a 1961 250 GT SWB Spyder California (pictured) that belonged to tough-guy actor James Coburn. Estimated at $4.6 to $5.9 million, it's considered one of the most beautiful and valuable Ferraris ever made. (Coburn used to race it around the Hollywood Hills with his pal Steve McQueen.) Also on offer: a 1951 Inter Coupe PF 512 that director Roberto Rossellini bought as an anniversary present for his wife, Ingrid Bergman ($1-$1.3 million); and, on the more modern end, a 2004 Enzo made for a member of a Middle Eastern royal familyâ€”the only example ever produced in gray ($1.2-$1.5 million). If that's a little out of your range, there's also plenty of Ferrari memorabilia on offer, from blueprints to carburetors. Can't wait until Sunday? The house is taking bids now.