The bag was made for the British-born singer and actor after a chance encounter with the head of the French luxury goods firm

A unique Le Birkin handbag, the only one of its kind made for the British-born singer and actor Jane Birkin, is to go on sale in Paris.

The prototype model of the iconic Hermès bag, which Birkin used for nine years, is expected to fetch a six-figure sum at auction next month.

Well-used and still bearing traces of the stickers Birkin irreverently stuck on the smooth black leather, the bag comes complete with the nail clippers she attached inside.

The head of handbags and fashion at Sotheby’s, Aurélie Vassy, said it was unique.