This 'barn-find' Aston Martin bought by a Devon man in 1972 for £1,500 is expected to fetch 100 times its previous value when it goes up for auction.
The DB5 Sports Saloon, which has spent more than 30 years cocooned in a Sidmouth garage gathering dust, is expected sell for between £150,000 and £200,000 at an auction in May.
The 1964 model, with less than 48,000 miles on the clock, has been offered for sale from the deceased estate of Aston Martin owners' club member David Ettridge, who lived in Sidford.
Mr Ettridge bought it for £1,500 in 1972, an amount that equates to approximately £14,000 in today's money.
The car, which has remained parked in his garage since 1980, is said to be in good condition but in need of restoration.
The engine, where a mouse nest made of shredded newspaper was found, was fired-up after 30 years of silence.
Fully-restored cars of that type would typically sell for above £320,000.
Auctioneers Bonhams said it represents a "rewarding restoration project" for an Aston Martin enthusiast.
James Knight, Bonhams group motoring director, said: "The Bonhams Motor Car department has handled the sale of numerous 'barn-find' Aston Martins over the past 15 years, but none of them have been in as good condition as this DB5.
"It requires restoration in the true sense of the word, restoring existing original components as opposed to replacing them. There is a growing appreciation of preserving cars to remain as original as possible, and this is an ideal candidate. The car returns to Newport Pagnell and will be offered for sale where it was originally built.
"There can be no greater satisfaction for the true enthusiast than restoring a once-great motor car to its former glory, and we hope the new owner of this time-warp will preserve as much of its original integrity as possible."
The 14th annual Bonhams sale of Aston Martin and Lagonda motor cars will take place at the factory's works department in Buckinghamshire on May 18.
Founded in 1793, Bonhams is one of the world's largest auctioneers of fine art and antiques.