The historic car number plate `S1` may fetch up to £250,000 when it is auctioned at Bonhams later this month.
It was the first registration number to be issued in Edinburgh when given in 1903 to Sir John MacDonald, founding member of the Automobile Club of Great Britain and Ireland, which later became the RAC.
Sir John, who was the Lord Justice Clerk of Scotland from 1888 to 1919, was one of the first owners of a car in Scotland and foresaw the need for a proper road system.
The number has been in Sir John`s family ever since it was issued, and was revived in 1958 after being allowed to lapse after the Second World War.
Bonhams said that while the number was the first to be issued in Edinburgh, the unavailability of certain records meant it was not possible to say whether it was the first one issued in Scotland.
The auctioneer expects "significant interest" in the sale, and says the sky may be the limit when it comes to the final selling price.
What is being offered is a DVLA v778 retention certificate, which gives the buyer the right to have S1 as the registration number for their car.
Copyright © PA Business 2008