Sir Mick Jagger’s love letters are being put up for auction.

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The Rolling Stones rocker penned a series of 10 letters in 1969 to his former flame, American singer Marsha Hunt – who inspired the band’s hit Brown Sugar and bore his first child – which will be auctioned off at Sotheby’s on 12 December.

“When a serious historian finally examines how and why Britain’s boy bands affected international culture and politics, this well-preserved collection of Mick Jagger’s hand written letters will be a revelation,” said Hunt, 66, in a statement.

The correspondence chronicles the couple’s “delicate love affair” and Hunt says the letters were written from the set of Jagger’s film Ned Kelly in Australia.

They discuss topical subjects of the moment like the first moon landing and John Lennon and Yoko Ono’s relationship.

Sotheby’s books specialist Gabriel Heaton said the collection – which includes song lyrics and a Rolling Stones playlist – shows a “poetic and self-aware” young Jagger.

He added: “They provide a rare glimpse of Jagger that is very different from his public persona: passionate but self-contained, lyrical but with a strong sense of irony.”

The letters are expected to fetch between £70,000 and £100,000.