(TELEGRAPH) — A previously unseen photo of Princess Diana as a teenager on a Swiss ski holiday is to go up for auction.

The intimate black and white picture is thought to have been taken during in 1979 or 1980, when Diana was aged 18 or 19, and before she met Prince Charles.

The photograph shows Diana lying beside a male companion who is resting a book on her shoulder. A bottle of Johnnie Walker whisky is on the window ledge in the background.

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