A signed racing helmet worn by Top Gear's The Stig is expected to fetch up to £1,200 when it goes under the hammer next month.
Sophia Vaizey, who worked as a production co-ordinator on the BBC show for 18 months, was given the white helmet as a present when she left.
It has been autographed by presenter Richard Hammond, other members of the production team and The Stig, who wore it between 2002 and 2005.
Ms Vaizey, from Hove, East Sussex, said: "The Stig wore that one on the show for quite a while. He then got a new one for safety reasons, so it got stored away in the Top Gear office.
"I was quite surprised when they gave it to me but also I felt honoured."
She has now put the helmet up for sale and is hoping that the ongoing legal battle surrounding the disclosure of The Stig's identity will generate even more interest in the item.
The 30-year-old added: "I'm quite a sentimental person and I don't want to let go of it, but as my family have said to me it might not be worth anything in 10 years' time."
The helmet will be auctioned at Gorringes Auctioneers in Lewes on October 20, spokeswoman Francesca Collin said.
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