The 1931 banner notched $525,800 at the Dallas house.
The Series III coupe is the only one of its kind with left-hand drive and a 6-cylinder engine.
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Sotheby’s London is offering two of the statesman’s canvases on November 21.
The sale of Lindley and Ann Bothwell’s 50 vintage vehicles will take place at the late couple’s ranch.
This month’s offerings include a rare edition of Ptolemy’s Geography and the collected works of Ian Fleming.
The personal belongings of Claude Monet and blue-chips postwar art are among the month’s market offerings.
The record of $46 million may be topped in these Heritage and Sotheby’s auctions.
This first edition is expected to reach $500,000—or more.