In terms of the value of physical collection, what is valuable is its long history and version history value in time, which can naturally be classified as cultural relics and ancient books.
As far as the market value of the collection is concerned, such books are actually very common in ancient books, because in ancient times, religious books (Buddhism and Taoism) were the most, followed by Confucian books, because many books are no longer scarce. It is usually a rare personal collection with high market value, especially those with local historical notes at that time.
As far as ancient books are concerned, it is natural to look at the year of engraving first, then at the edition of engraving, and then at the content. This constitutes the market value of ancient books. Therefore, other valuable ancient books are mainly due to their long history and few versions, such as "Song Edition Book" and "Movable Type Edition".
As far as Buddhist scriptures are concerned, it is necessary to investigate when they were carved, whether they are some important versions of the Tripitaka, and finally whether there are inscriptions or sponsorship instructions from people at that time. And the same engraving can continue to be printed after decades or even hundreds of years. For example, the Longzang engraving in the Qianlong period of the Qing Dynasty can still be used and printed, so although the source of the version is an old engraving, it belongs to a new seal and needs attention. Generally, some newly printed ancient books will be added with a title, indicating when they were just printed and when they were reprinted.