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Signet is an Imprint of the New American Library ([[Publisher:NAL|NAL]]). Since NAL were acquired by Penguin in 1987, "Penguin/Signet" books have appeared.

Usual ISBN prefix 0451.
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== Catalog numbers and price coding ==

* Up to 1958 Signet used just a number for their catalog number. If they reprinted at a higher price they used a new number. The range of numbers issued for each year has not been researched.
* Between 1958 and 1961 Signet started using a letter prefix to indicate the price. The numbering continues as before.
** s ### - 35¢ (lower case s)
** D ### - 50¢
** P ### - 60¢
** T ### - 75¢
** Y ### - $1.25
** W ### - $1.50
** E ### - $1.75 or $2.25 (need more data, $1.75 is more likely)
* Some imprints had a letter in front of the price code
** Cx ### - Signet Classics. The "x" is the price code. For example CQ494 is a Signet Classic book priced at 95¢.
** Kx ### - Signet Key. The "x" is the price code
* In 1968 Signet started coding the catalog number on the spine as 451-x###-zzz where x is the price code, ### is the catalog #, and zzz is the price.
* In 1977 Signet dropped the catalog numbers and started using ISBNs. The incrementing catalog number continues to be used.
* In 2007 Signet started using ISBN-13. The incrementing catalog number continues to be used and is up to the 22000s.

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