One of the rarest records in the world by a virtually unknown British band is tipped to sell for more than £10,000.
The LP is one of just 64 copies produced by the psychedelic rock group Dark in 1972.
Experts say the album, called Dark Round the Edges, is regarded as the 'Holy Grail' for serious record collectors, as very few copies exist today.
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It was the band's one and only album before they split up. The one coming up for sale was given as a gift to Elizabeth Kaufman by friend Ron Johnson, who was the bass guitarist for the band.
She never played the album herself but loaned it to her brother for a while.
It spent the next 25 years gathering dust in the loft of her home in Northamptonshire. The record was dug out ahead of a recent refurbishment of the loft.
It is now coming up for sale with Omega Auctions Newton-Le-Willows, Merseyside.
Richard Kaufman, Mrs Kaufman's son, said: "My mother was friends with Ron Johnson and he gave the record to her. She never really played it to be honest and it ended up in the loft. At one stage she leant it to her brother and that is why it isn't in mint condition.
"Mum said that Ron told her about 20 years ago that the LP was worth a bit of money. But she forgot about it until we had the loft re-done.
"She turns 70 next month and the sale will give her a little bonus for her retirement. It is a lovely surpise for her."
Dan Hampson, of Omega Auctions, added: "It is one of the rarest records in the world - the Holy Grail of record collecting. I had never heard of this band until I started working here.
"They are a group that taken on almost mythical status thanks to the rarity of this album. It has helped build a legend.
"Dark must have put everything into it this one record before packing it in."
Mr Hampson said that before they split up Dark had been on the verge of being the support act for Status Quo but it fell through.
Dark were made up of Steve Giles, Martin Weaver, Ron Johnson and Clive Thorneycroft.
The sale takes place on Wednesday.
