The value of an old book collection depended on many factors such as the quality of the book, the time of publication, the author, the publishing house, the content, the edition, the rarity, and so on. Some old books may have very high collection value because they may be classics, rare versions, or rare content. An important question when collecting old books is to determine whether they are worth collecting. This may require in-depth research on the content of the book, the author, the publishing house, the time of publication, etc. to determine whether they have collectible value. Collecting old books is a challenging hobby but also very valuable. If you are interested in old books, it is recommended to learn more about them and find some experienced old book collectors or auction houses for reference.