What the Numbers Mean

The system of numbering and documentation of fine-art editions is designed to guarantee the authenticity and originality of prints in the art market. Each print is signed by the author (usually, but not always) in the lower right-hand corner or margin. In the opposite corner goes the edition numbering, two numbers divided by a slanted stroke. The bottom number represents the total number of prints in the edition; the top one the order in which the artist has signed that particular print.
 

Types of proofs

Beside numbered prints, a fine-art edition usually includes artist's proofs. These proofs, designated P/A (in Spanish, prueba de artista). The number of these proofs is customarily 5-10% of the total number of the edition. (More would be considered abusive.) So an edition of 50 would have a maximum of five artist's proofs. Sometimes these proofs are numbered with Roman numerals, e.g.: I/V, II/V, III/V, etc.

Some of the most valuable proofs do not form part of the edition. These are the trial proofs (P/E, in Spanish pruebas de estado) which the artist pulls in the process of creating the final print. A series of trial proofs represents a unique record of the work in process and, as such, is highly sought after by fine-art print collectors.

One sometimes sees "H/C" written on the margin of a print. This is a French annotation "hors de commerce," which usually indicates that the print was a gift or was unsuitable for selling.

In addition, every edition has a single "bon à tirer," which is the artist's final proof, the ideal which all the prints of the edition must emulate.

Additional documentation

Nowadays many artists like to accompany their prints with a "certificate of authenticity," (in Spanish, certificado de autenticidad) with addtional information, a detail which is appreciated by many collectors. This certificate usually includes, besides the artist's signature, the following data about the print:

• The total number of the edition
• The number of the print
• The workshop where the print was made and who did the actual printing
• The date of printing
• The techniques employed.

Information provided by: http://www.worldprintmakers.com