Chances are you’ve read a Winnie the Pooh book at some point in your life. But if you have a first-edition copy of any of the books then you could have a small fortune on your hands – mint copies of Now We Are Six, the fourth volume in the collection, can fetch up to $40,275 (£32,500). Any versions featuring the original illustrations from Ernest H Shepard and signatures from either the artist or Milne himself are worth having valued just in case.

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