One of the most important motor cars in the world emerges from its secret hideaway for the first time in 50 years.

The 1937 Bugatti Type 57S originally owned by Earl Howe, whose existence has only been known to a handful of people during the last 50 years will be sold at Bonhams’ Retromobile sale in Paris on 7 February 2009. This highly significant motor car is estimated at €2.75 – 4 million.

The Bugatti with Atalante coachwork retains all the attributes that will ensure its appeal to the world’s most discerning collectors. It has a spectacular provenance having been owned by Earl Howe, Lord Ridley, Harold Carr and others; it has a continuous and chronicled history; and it has exceptional originality retaining original chassis, engine, drivetrain and body. It even has what appears to be a remarkably low mileage with an odometer reading of just 26,284.

James Knight, International Head of Bonhams' motoring department said: "I have known of this Bugatti for a number of years and, like a select group of others, hadn’t dared divulge its whereabouts to anyone. It is absolutely one of the last great barn discoveries, and we at Bonhams are honoured to have been selected to handle its sale.”

Bugatti Type 57S, chassis no. 57502, was completed at the Bugatti works on 5 May, 1937 sporting two-seat Atalante coupe coachwork. It was ordered new by no less than the motor sport great – and the BRDC’s (British Racing Driver’s Club) first President - Earl Howe via UK Bugatti agents, Sorel of London. Howe had a long association with Ettore Bugatti and his machines, and developed a close friendship with Ettore and his son Jean, having raced their Grand Prix motor cars.

Earl Howe took delivery of 57502 on the 9 June 1937 and was to retain his Bugatti for over eight years. He added a personal touch by fitting his own bumpers, rear-view mirrors on the A-pillars and a luggage rack, which it still retains to this day. It was to become his personal companion, escorting him to Brooklands and other race meetings. The car would have seen relatively little use during the Second World War as Earl Howe served with the Royal Navy Volunteer Reserve.

After hostilities ceased, the T57S was sold via Continental Cars to a Mr J P Tingay in 1947. It was Tingay who effectively brought the car to ‘SC’ specification by fitting a Marshall K200 supercharger – as finding an original Bugatti blower proved nigh on impossible so soon after the War.

Mr M H Ferguson acquired the Bugatti from Tingay in 1950 and by 1954 it formed part of Lord Ridley’s collection. Dr Harold Carr then acquired it in 1955 from Lord Ridley. Dr Carr drove the car for the first few years but in the early 1960s it was parked in his garage where it remained for nearly 50 years, until Dr Carr’s death in 2007. The T57S is being sold on behalf of the family of Dr Carr, and will be offered with an extensive file of correspondence documenting its fascinating history.

James Knight said: “The Atalante is incredibly original and, although she requires restoration, it is “restoration” in the true sense of the word. From my perspective, save for some of the interior, all original parts can be restored or conserved in order to maintain originality. It offers a truly rewarding project to the new owner - who will join a select list of distinguished owners – to play such an integral part in bringing this wonderful motor car back to life. It has all the finest attributes any connoisseur collector could ever seek in one of the ultimate road-going sports cars from the golden era of the 1930s."