SAN FRANCISCO, CA.- Bonhams foray into the Scottsdale auto auction week proved to be a strong success with a sale total of $6.2 million. Amidst the grounds of the beautiful and conveniently accessible AAA Four Diamond Westin Kierland Resort, an impressive and diverse line-up of cars offered buyers an unparalleled array of pedigree machinery from which to choose. The top seller of Thursday’s sale was a well-documented 1937 Mercedes-Benz 540K Cabriolet C, which brought $667,000 after a fierce bidding battle between home markets, the UK, eastern Europe and the Far East. Offered from a New York collection where it had resided for more than 40 years, the car will return to continental Europe for the first time since it was built. The true star of the auction, however, was the cover lot – the impeccable Marlene Dietrich 1929 Rolls-Royce Phantom I Transformable Phaeton, which made its top estimate at $524,000