World's most valuable autographs(Image: Peter Byrne - PA Wire)

Have you got an old celebrity autograph gathering dust? Ever wondered how much it might be worth? If you're lucky enough to own one from the Paul Fraser Collectibles' PFC40 Autograph Index, then you could be sitting on a small fortune.

They say the value of the top 40 signatures in their list grew by 5.2% in the past year and the value of the whole index has grown by 358% since 2000.

From Einstein to the men that walked on the moon to Lord Nelson and the Beatles, we take a look at some of the most valuable signatures money can buy.

Images included in this gallery are for illustrative purposes only, and do not necessarily represent the values mentioned. You are strongly advised to establish the authenticity of any autographs before buying them as fakes do exist.