For some artists, signed and unsigned editions occupy entirely different markets. For others, the premium is much smaller, and certain unsigned works can still perform competitively because of their rarity, imagery or broader market appeal.
Understanding how signature functions within a particular artist’s market is far more useful than assuming it carries the same weight everywhere.
How Much Does a Signature Affect the Value of a Print?
A signature changes more than a print’s value – it changes the market against which it should be assessed. An unsigned print can still be highly desirable, but it is often competing within a different segment of an artist’s market, meaning a different set of comparable sales becomes relevant.
A signed and an unsigned impression can share the same image, edition and publication history, yet attract different buyers, trade in different value brackets and follow different market dynamics.
Rather than treating signature as a simple premium applied to every print, specialists use it as a key point of reference when valuing a work. It helps identify the most relevant comparable sales, understand which buyers are likely to compete for it and establish realistic pricing expectations from the outset.
While signed works consistently achieve higher average prices, the size of that premium varies considerably, reflecting the unique structure of each artist’s market.
Banksy Shows Why Signature Can Create Entirely Different Markets
Banksy's market shows exactly how much signature affects value.
Unlike many blue chip print artists, signed and unsigned Banksy editions trade regularly and in significant numbers – and both are authenticated by Pest Control. That means the price gap isn’t driven by doubts over authenticity. It largely reflects the value the market places on a signature.
Between 2025 and April 2026, signed Banksy prints achieved an average hammer price of £47,288, compared with £15,980 for unsigned examples – nearly 3x. Signed impressions of Girl With Balloon averaged £132,567 while unsigned examples averaged £64,291 – roughly 2x. The premium holds at both the market level and the individual-image level, even if the exact multiple varies. In Banksy’s market, a signature doesn’t simply add value – it creates two distinct collecting tiers with different buyer pools and pricing expectations.
Why Signature Doesn’t Mean the Same Thing Across Every Artist
Unsigned Andy Warhol prints are far rarer at auction than signed ones – just 83 unsigned lots appeared during the same period, against 705 signed examples. Signed works still command a real premium, averaging £52,849 compared with £15,655, but that gap often isn't measuring the same thing twice. Many unsigned Warhols began life as posters, test prints or gifted impressions rather than editions intended for commercial release. With no authentication committee for Warhol's prints, those unsigned works typically don't appear in the catalogue raisonné at all. The market does recognise some value in a handful of unsigned works from before the authentication process was formalised, but even these trade for considerably less than their signed counterparts.
Roy Lichtenstein's market follows the same pattern, only more starkly. Signed impressions have averaged £43,204 across the period analysed, compared with just £4,481 for unsigned examples – and unsigned Lichtensteins are rarer still than unsigned Warhols, with only two appearing at auction in the same window.
Keith Haring's market sits somewhere between Banksy and Warhol.
Pop Shop, one of Haring’s most sought-after collections, includes both estate-signed and hand-signed impressions. Estate-signed works occupy a different price tier from hand-signed editions, largely because of differences in rarity and edition structure rather than any uncertainty over authenticity. As with Banksy, both are recognised by the market but appeal to different groups of collectors.
Signature becomes even more significant in collaborative works such as Andy Mouse. Created in 1986 by Haring and Andy Warhol, the portfolio consists of four screenprints in an edition of just thirty, with each print signed by both artists. Collectors are not simply paying for two signatures. They are buying one of the most significant collaborations in twentieth-century printmaking, bringing together two established artist markets. Across four auction appearances during the period analysed, the Andy Mouse collection achieved an average hammer price of £141,262, almost five times the average for Haring’s hand-signed prints overall.
These examples show that, in Haring’s market, a signature isn’t simply a premium added to an otherwise identical work. It helps define how collectors understand rarity, significance and the position of a print within the wider market.
Signature Is One Part of a Much Bigger Picture
Signature is not assessed in isolation. Specialists also consider condition, edition type, authenticity, provenance and current demand alongside it. A signed print with significant condition issues may underperform an exceptional unsigned example, while exceptional provenance or a rare colour variant can lift a price well beyond what signature status alone would predict.
That combination is what a valuation is actually built on: not a fixed premium applied because a work carries a signature, but a read on how that signature interacts with everything else about the print in front of you.
Signature remains one of the most influential factors in the prints and editions market, but its significance is always shaped by context. The most meaningful valuations come not from asking whether a print is signed, but from understanding what that signature means within the market for that particular work.
Methodology: Figures in this report are drawn from auction results recorded between January 2025 and April 2026 across major international and regional auction houses in the blue chip prints and editions market. This period was chosen to reflect the most current and relevant view of market conditions.
While every effort has been made to ensure accuracy, this report may contain errors or inconsistencies. It is intended for research and informational purposes only and should not be relied upon as financial or investment advice. MyArtBroker accepts no liability for any loss or damage arising from reliance on the information contained within this report.
