Q: I came across this book (A Christmas Carol) in my father’s belongings. I wondered what it might be worth and where I might go to sell it?

A: Your book was published in 1900 as part of the Vademecum Series. http://henryaltemus.com/series/series180.htm
The books of this series are all reprints and in 1900 came in a labeled box.

Although A Christmas Carol is a very well known and love book, these rather ordinary reprints seldom sell for more than a few dollars.