Antiquarian book collecting may be roughly defined as an interest in books printed prior to 1900 and can encompass interest in 19th, 18th, 17th, 16th, and 15th-century books. Antiquarian book collectors are not exclusively interested in first editions and first printings, although they can be. European books created before 1455 are all hand-written and are therefore one-of-a-kind historical artifacts in which the idea of "edition" and "printing" is irrelevant. There is also an interest among antiquarians for books beautifully made with fine bindings and high quality paper. For many books printed before about 1770, the first edition is not always obtainable, either because of price and/or availability. Later editions/printings from an era of interest are still often desirable to the antiquarian collector as they are also artifacts.