Hello, I wonder if anyone can help...I've acquired an edition of Dickens 'David Copperfield', Household Edition, Chapman and Hall. It is undated but the picture of Dickens inside is dated 1868 and Chapman and Hall stopped publishing him after 1870, so it must be an edition of around 1868-70.

Here's the thing. It is signed below the picture of Dickens, with his signature. Then it is dated '1870.' (with the full stop). I have checked autograph sites and it is very much as his signature was at that point in his life. I have checked for all the obvious signs that it is a forgery. In 1870 he died, but he was active, giving readings and so forth for the first 5 months of that year.

So, my first question is, how on earth do I know if I have a geniune signature? Are there a lot of Dickens' forgeries? Secondly, if it was genuine, where would you go to sell it?