Lord Baden Powell with the Duke of Windsor when he was Prince of Wales
The scout hat worn by the founder of scouting, Lord Baden Powell, is expected to fetch up to £1,000 when it goes under the hammer in East Sussex.
The wide-brimmed felt hat, with leather headband and buckle, is being auctioned as part of a collection of memorabilia owned by sculptor Bryan Mickleburgh.
Other items in the collection include a white Stetson and gloves which belonged to cowboy actor Roy Rogers.
The sale is being held on Thursday at Wallis and Wallis auctioneers in Lewes.
One of Mr Mickleburgh's most important works is a life-size statue of Buffalo Bill which stands in Cody Park, Nebraska.
"He made friends with various people, including the Red Indian chief 'Iron Eyes Cody', who was in over 100 Western films," said auctioneer Roy Butler.
"He also met Roy Rogers, who gave him this hat and a pair of ornamental gloves."
He said Mr Mickleburgh bought Lord Baden Powell's hat when it was sold along with other items from Gilwell Park scout training centre in north London.
"Although we all wore scout hats when we were younger, this one is different," said Mr Butler.
"It is very well constructed and heavier than normal."
Lord Baden Powell went to Rose Hill School in Tunbridge Wells, Kent and Charterhouse School in Godalming, Surrey.
He founded the Scout Movement in the early 1900s after returning from service overseas with the British Army.
Auctioneer Roy Butler saw Lord Baden Powell wearing the hat