Publisher:Signet
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Signet is an Imprint of the New American Library (NAL). Since NAL were acquired by Penguin in 1987, "Penguin/Signet" books have appeared.
Usual ISBN prefix 0451.
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.