A 1903 Clement model AC4R rear entrance tonneau has sold for £415,900 ($643,607) at Bonhams London.
The car was among the headline lots of the London to Brighton classic car auction on October 30.
The Clement AC4R was one of the most technologically advanced cars of its era, with a powerful steel-framed engine.
Clement-Bayard started out as a bicycle manufacturer, before moving in to the realm of cars and aeroplanes.
Bonhams comments: "This example returns to the UK from American ownership and has a long known British history. It's very earliest days were recorded in the program for the London to Brighton Run in 1934…
"Over the course of nearly 4 decades of ownership the car has been used on the London to Brighton on a number of occasions, particularly in the early days of its custody. Maintained in the UK for some time, it received a new crankshaft and mechanical work in the 1980s."
A 1904 Napier model D45 tourer also sold well, achieving £326,333 ($505,001).
Napier had been a printing manufacturer before making the switch to auto engineering. The present lot is one of a small number built in America to avoid import tax.
The auction house states: "Napier No.49 is a car of British manufacture, assembled in period in America, has been part of three major international car collections, has four cylinders, a four speed gearbox, carries five passengers in comfort, has rarity in spades and comes with an enviable record of completed Brighton Runs."
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