Keith Haring's signatures, edition numbers and proof designations are important details when researching an original print. Many Haring prints produced during his lifetime were hand-signed, dated and numbered, while others were issued as artist's proofs, printer's proofs, trial proofs or other impressions outside the standard numbered edition.
These markings can help identify a particular edition, but they should never be considered in isolation. A signature or edition number should correspond with the documented characteristics of the work, including its medium, dimensions, paper, printer or publisher and catalogue raisonné information.
Expert review: by Robert Ubillus Adelman, Owner & Director of Masterworks Fine Art, with decades of experience buying, selling, and evaluating original modern and contemporary prints.
Keith Haring Signature & Proof Marks at a Glance
| Marking | Meaning | What It Tells You |
|---|---|---|
| 23/100 | Numbered Edition | Impression 23 from a regular edition of 100 |
| AP / A.P. | Artist’s Proof | An impression outside the regular numbered edition, generally reserved for the artist |
| PP / P.P. | Printer’s Proof | An impression outside the regular edition, generally reserved for the printer or workshop |
| TP / T.P. | Trial Proof | A proof produced during development of the edition; some Haring trial proofs differ in color, composition, or printing sequence from the final edition |
| HC / H.C. | Hors commerce | A proof outside the commercial edition, often reserved for the artist, publisher, printer, or associates |
| Roman numerals | Proof numbering | A designation such as VII/XII identifies the seventh impression from a group of twelve proofs |
| Estate signature / inscription | Estate-authorized edition | Indicates an authorized edition associated with the Keith Haring Estate rather than a lifetime signature by Haring |
| Estate stamp | Estate documentation | May appear on authorized editions completed, documented, or issued around or after Haring’s death |
| Blindstamp | Printer / Publisher mark | An embossed workshop or publisher mark that can help confirm the documented printer, publisher, and edition |
Proof structures vary considerably between Keith Haring editions. An AP, PP, TP, HC, Estate marking, or other designation should always correspond with the documented specifications for the particular work and should never be interpreted in isolation.
How Did Keith Haring Sign His Prints?
Many of Keith Haring's limited-edition prints were signed by the artist in pencil, often together with the date and edition number.
The exact location and form of the signature can vary depending on the print. Some editions were signed in the lower margin, while other works may contain signatures, inscriptions or edition information in different documented locations.
Because Haring's signature naturally varied, collectors should not attempt to authenticate a print simply by comparing the appearance of one signature with another. The signature should instead be evaluated as one element of the specific documented edition.
Understanding Keith Haring Edition Numbers
A standard limited-edition number is commonly written as a fraction.
For example:
23/100
means that the impression is number 23 from a standard edition of 100.
The number before the slash identifies the individual impression, while the number after the slash represents the size of the numbered edition.
A lower edition number does not automatically make a Haring print more valuable. For example, 5/100 is not necessarily more desirable or valuable than 75/100 simply because the number is lower. Condition, image, series, rarity, provenance and overall collector demand are generally more important factors.
Keith Haring Artist's Proofs: AP
Collectors frequently encounter Keith Haring prints marked AP, meaning Artist's Proof.
Artist's proofs are impressions produced outside the standard numbered edition. For example, a print might exist in an edition of 200 with an additional 30 artist's proofs, numbered separately as AP 1/30 through AP 30/30. Phillips has catalogued Pop Shop I impressions numbered AP 6/30 and AP 18/30 outside the regular edition of 200.
Artist's proofs can be desirable to collectors, but an AP designation does not automatically make a print more valuable. The specific work, rarity, condition and market demand must also be considered.
Printer's Proofs: PP
Some Keith Haring editions also include printer's proofs, commonly designated PP.
Printer's proofs were generally reserved for the printer or individuals involved in producing the edition and exist outside the standard numbered edition.
For example, Christie's has documented a complete Pop Shop II portfolio numbered PP 10/10, from a printer's proof edition of ten sets, in addition to the standard edition of 200 and twenty artist's proofs.
Because proof structures vary from one edition to another, collectors should confirm that a PP designation corresponds with the documented specifications for the particular Haring work.
Trial Proofs: TP
A TP, or Trial Proof, can represent an impression created during the development of a print before the final edition was completed.
Trial proofs can be particularly interesting because they may show variations in color or other aspects of the printing process.
Haring's Growing series provides an important example. In addition to the standard edition of 100 and artist's proofs, Haring created unique color-variant trial proofs. Christie's has catalogued an example numbered TP 5/40, one of forty unique color-variant trial proofs.
Because some Haring trial proofs are unique color variants, the TP designation can identify an impression that differs materially in appearance from the standard edition.
Hors Commerce Proofs: HC
HC is an abbreviation for the French term hors commerce, meaning roughly “not for sale.” HC impressions were produced outside the commercial numbered edition and could be reserved for the artist, publisher or others associated with the project.
For example, Phillips has catalogued a Pop Shop III impression numbered HC 8/20, an hors commerce impression outside the regular edition of 200 and its artist's proofs.
Not every Haring edition included HC impressions, and quantities varied. Christie's, for example, has documented Pop Shop IV as having a standard edition of 200, artist's proofs and twenty hors commerce sets.
Other Signatures, Stamps and Publisher Marks
Depending on the edition, a Keith Haring print may contain additional identifying information beyond the artist's signature and edition number.
These can include:
- Printer's blindstamps
- Publisher's blindstamps
- Publisher ink stamps
- Estate stamps
- Printer signatures
- Portfolio or colophon information
- Inscriptions or dedications
These markings vary considerably by edition.
For example, Christie's has documented Growing prints published by Martin Lawrence Editions with the publisher's blindstamp and ink stamp on the reverse. Publisher and printer information can therefore provide useful supporting evidence when researching an edition.
Estate-Signed and Posthumous Keith Haring Editions
Collectors should distinguish between works signed by Keith Haring during his lifetime and editions completed or released in connection with his Estate. Haring died on February 16, 1990, and certain projects near the end of his life have distinctive signing and estate documentation.
For example, Best Buddies from 1990 has appeared at Phillips as an artist's proof bearing an Estate stamp on the reverse and signed and dated by Julia Gruen as executor, rather than carrying Haring's own handwritten signature in the same manner as many earlier lifetime prints.
Collectors should therefore distinguish clearly between a lifetime print hand-signed by Keith Haring and an authentic Estate-authorized edition carrying Estate documentation; both may be legitimate, but they represent different signing structures.
Are All Authentic Keith Haring Prints Signed?
No. Not every authentic Keith Haring print is necessarily hand-signed by the artist, and the absence of a signature alone does not prove that a work is inauthentic. Some documented proofs, Estate-authorized editions, or other legitimate impressions may carry different signatures, inscriptions, stamps, or edition markings.
Likewise, a convincing Keith Haring signature does not authenticate a print by itself. The signature should be evaluated together with the edition size, proof designation, paper, dimensions, printer or publisher, catalogue raisonné reference, provenance, and any documented Estate or workshop markings.
Authentication depends on whether the complete work corresponds with the known specifications of the edition—not simply whether a signature is present.
Does a Keith Haring Signature Prove Authenticity?
No. A signature is only one component when researching a Keith Haring print. The work itself should also correspond with the documented edition, including its medium, paper, dimensions, edition structure, printer or publisher, provenance and catalogue raisonné information.
Learn more: How to Authenticate a Keith Haring Print →
Keith Haring Catalogue Raisonné and Edition Documentation
An important reference for Haring's editions on paper is Klaus Littmann's Keith Haring: Editions on Paper 1982–1990, The Complete Printed Works. When researching a signature, edition number or unusual proof designation, collectors should compare the work with the appropriate catalogue entry rather than relying on the marking alone.
Learn more: Keith Haring Catalogue Raisonné →
How to Check a Keith Haring Signature & Edition Number
When examining a signed Keith Haring print, confirm that the following details correspond with documented examples of the specific edition:
- Signature — placement, writing medium, and overall form
- Date — present and positioned correctly when the documented edition is dated
- Edition number — matches the known regular edition size
- Proof designation — AP, PP, TP, HC, or other documented proof type where applicable
- Paper and dimensions — consistent with the documented support and published measurements
- Printer / publisher — corresponds with the known production history of the edition
- Blindstamps or ink stamps — present when documented for the specific work
- Catalogue reference — matches the recognized Haring catalogue raisonné entry
A convincing signature should never override inconsistencies elsewhere in the print. Authentication depends on whether the signature, edition structure, materials, dimensions, marks, and documentation all correspond with the known specifications of the work.
Buying a Signed and Numbered Keith Haring Print
Before purchasing a signed and numbered Keith Haring print, collectors should understand exactly which edition or proof they are considering and confirm that the signature, numbering and physical characteristics correspond with the documented work.
Masterworks Fine Art specializes in original Keith Haring prints, including signed and numbered editions and proofs. Works offered by Masterworks Fine Art are carefully researched and include our Certificate of Authenticity and relevant catalogue raisonné documentation when applicable.
Explore Keith Haring Prints for Sale →
Frequently Asked Questions About Keith Haring Signatures and Edition Numbers
Did Keith Haring sign his prints?
Yes. Many Keith Haring limited-edition prints produced during his lifetime were hand-signed, often in pencil and frequently accompanied by the date and edition number. However, signature practices vary by edition, so collectors should compare a work with the documented specifications for that particular print.
What does AP mean on a Keith Haring print?
AP means Artist's Proof. Artist's proofs are impressions produced outside the regular numbered edition. For example, an edition of 200 might also include 25 or 30 artist's proofs numbered separately as AP 1/25 through AP 25/25. The exact number of proofs varies by Haring edition.
What do PP, TP and HC mean on Keith Haring prints?
PP usually means Printer's Proof, TP means Trial Proof, and HC means hors commerce. These impressions exist outside the standard numbered edition and were produced for different purposes. Because Haring's proof structures vary between editions, the designation should be checked against the documentation for the specific work.
Are Keith Haring artist’s proofs more valuable than numbered prints?
Not automatically. Artist’s proofs are often produced in smaller quantities than impressions from the regular numbered edition and can be desirable to collectors, but value depends on the specific image, rarity, condition, provenance, proof structure, and market demand. An AP designation alone does not guarantee a higher value.
Can an authentic Keith Haring print be Estate-signed instead of signed by Haring?
Yes. Certain authentic editions completed or issued around or after Keith Haring’s death may carry Estate documentation or the signature of an Estate representative rather than Haring’s handwritten signature. The correct signing structure depends on the particular edition and should be compared with recognized catalogue raisonné references, publisher or workshop records, and documented auction examples.
Is a lower edition number more valuable?
Not necessarily. A Haring print numbered 5/100 is not automatically worth more than one numbered 75/100. The specific image, series, rarity, condition, provenance, documentation and overall collector demand generally have a greater influence on value than the individual number within the standard edition.
Does a Keith Haring signature prove a print is authentic?
No. A signature should be evaluated together with the print's medium, dimensions, paper, edition information, printer or publisher, provenance and catalogue raisonné reference. A signature alone is not sufficient evidence that a Keith Haring print is authentic.
Learn more: How to Authenticate a Keith Haring Print →
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