Hoping someone can help?

I have - what I believe to be - a 1st Edition, Charles Dickens Nicholas Nickleby. Half leather with marble boards. It has the inscribed picture of Dickens and is dedicated to W.C.Macready. Illustrations by Phiz.

There are not dates so I am not sure if it is 1st Edition. The 'odd' thing is that the spine doesnt have anything on it apart from:
E.755.

Its in average condition at best.

Anyone enlighten me on value and other detail?

Thanks

Carl