Considerations in Evaluating Rarity

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1.

age--early and important imprint dates

2.

irreplaceability--scarcity

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uniqueness or association value

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local or archival interest

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"Simply stated, rare books are uncommon books. More specifically, rare books are identified by their contents or physical characteristics which command more than ordinary attention among book collectors, librarians, scholars, and booksellers. Neither rarity nor age alone can determine the value of a book; there are literally thousands of old books which have no value. When, however, a book possessing either or both of these qualities contains additional significant features which make it both unusual and of great interest, then it may be considered valuable.

Many qualities can make a book unusual and interesting. A beautiful or peculiar binding, typographical excellence, and illustrations by a noted engraver are a few of the external characteristics which influence value. Previous ownership by a distinguished person frequently lends luster to an otherwise prosaic volume. But the contents of a book and the esteem with which it is regarded are controlling factors in determining whether or not a book is properly considered a rarity."

It should be considered rare if everyone wants it; it is difficult to get; or it is held in esteem as valuable or important.