A Rare Books Dealer Built on Obsession, Not Volume
Based in Valencia, Spain. Serving collectors across the United States, the United Kingdom, and the European Union.
The Founding Conviction
Cervantes Rare Books was not born from a business plan. It was born from a growing disillusionment with an industry that had allowed itself to become complacent in the face of an evolving threat.
The signed-book market operates on trust. Collectors spend thousands — sometimes tens of thousands — of dollars on the faith that a signature is genuine. And yet the mechanisms we rely upon to verify that trust are, in our considered professional opinion, dangerously inadequate.
The major authentication houses were built in an era when forging a convincing signature required real skill and real risk. That era is over. Today, anyone with an internet connection can pull up high-resolution images of an author's signature. Anyone with a few hundred dollars can acquire autopen equipment capable of reproducing a signature with mechanical perfection. The barriers to forgery have collapsed, but the authentication industry has not adapted.
We founded Cervantes Rare Books to provide an alternative — one built on the premise that depth of expertise, not breadth of coverage, is the only reliable defense against modern forgery.
Why Specialization Matters
Consider the following scenario. An authenticator at a major house examines signatures from ten thousand different signers. They might see a David Foster Wallace signature once every few months. They have perhaps a dozen reference exemplars in their files. They spend thirty seconds, perhaps a minute, forming an opinion.
Now consider us. We have personally held, examined, and authenticated over thirty signed first editions of Infinite Jest alone. We have studied the way Wallace's hand changed between his early career and his final years. We know the angle at which he held his pen, the way his "D" varied between inscriptions and pure signatures, the pressure patterns that distinguish his hurried convention signatures from his considered bookshop inscriptions.
This is not a matter of opinion. This is a matter of sample size, of focused study, of accumulated practical knowledge that cannot be condensed into a thirty-second glance by someone who authenticated a basketball jersey twenty minutes ago.
We maintain five flagship author collections — Wallace, Rowling, Chomsky, Murakami, and Ishiguro — where our holdings are, to our knowledge, unmatched by any other dealer in the world. Beyond these, we specialize in thirteen additional authors whose signatures we have studied with equal rigor.
Based in Valencia
Our operations are headquartered in the L'Eixample district of Valencia, Spain — a city whose literary heritage stretches back to the fifteenth century and the birth of Spanish printing.
Our books are stored in a purpose-built, climate-controlled facility where temperature, humidity, and air quality are carefully regulated to minimize the effects of aging. We believe that preservation is not an afterthought — it is a fundamental responsibility of anyone who deals in objects of cultural and material significance.
Though we are based in Europe, our market is global. We primarily serve collectors in the United States, the United Kingdom, and across the European Union. We ship internationally with full insurance and professional packaging designed to protect books of exceptional value.
"A rare book deserves more than a cardboard box and a certificate of authenticity printed on a laser printer. It deserves expertise, care, and a dealer who will stake their reputation on every sale."
— John Kowalski, PhD, Founder of Cervantes Rare BooksVisit us:
C/ de Cadis, 50, L'Eixample, 46006 València, Valencia, Spain
Giving Back
We donate 10% of our entire revenue — not profits, revenue — to the National Pediatric Cancer Foundation through the eBay for Charity program. The money is sent directly by eBay, ensuring full transparency and accountability.
We chose the National Pediatric Cancer Foundation because their focus on the Sunshine Project — an innovative collaboration bringing together the nation's top doctors and researchers — pushes pediatric cancer research forward in ways that benefit children not only in the United States but globally, through clinical trials whose findings extend far beyond national borders.
Every book you purchase from Cervantes Rare Books directly funds research to eliminate childhood cancer. We believe that dealing in objects of cultural significance carries a responsibility to give back, and we have chosen to honor that responsibility with a commitment that is meaningful, measurable, and permanent.
How We Help New Collectors
Building a collection of signed first editions is a deeply personal pursuit, and every collector's journey is different. Some begin with a single book by a beloved author. Others start with a deliberate strategy to acquire the key works of a particular literary movement. Whatever your approach, we believe informed collecting is rewarding collecting, and we are always happy to share our knowledge.
Start with what you love
The most successful collectors — and the happiest ones — collect what they genuinely love to read. A signed first edition of your favorite novel is an object you will treasure regardless of its market trajectory. If it also appreciates in value over time, that is a welcome bonus. But the foundation of any good collection is passion, not speculation.
Buy the best you can afford
In rare book collecting, condition matters enormously. A fine-condition first edition with a dust jacket will always outperform a good-condition copy without one. Similarly, a signed copy from a specialist dealer with a lifetime guarantee will hold its value far better than a cheaper copy of uncertain provenance. We recommend buying fewer books of higher quality rather than more books of lower quality.
Authentication is everything
A signed book is only as valuable as its authentication. An unauthenticated signature is essentially worthless from an investment perspective, because any future buyer will demand proof. Purchasing from a specialist dealer who provides a detailed Letter of Authenticity and a lifetime guarantee is the safest approach. At Cervantes Rare Books, every book we sell comes with both — because we believe accountability is inseparable from authenticity.
Our Name
We named ourselves after Miguel de Cervantes — not because we specialize in Spanish literature, but because Cervantes understood something fundamental about the tension between appearance and reality, between what the world presents and what lies beneath.
Don Quixote tilted at windmills, mistaking them for giants. The signed-book market, in our view, has been doing much the same — mistaking certificates for certainty, mistaking volume for competence. We prefer a different approach: patient, focused, and uncompromising.
Questions About Cervantes Rare Books
Who is behind Cervantes Rare Books?
Cervantes Rare Books was founded by John Kowalski, PhD, a specialist in authenticated signed first editions with deep expertise in approximately 20 literary authors. The company is based in Valencia, Spain, and serves collectors across the United States, United Kingdom, and European Union. Our founding conviction is that depth of expertise — not breadth of coverage — is the only reliable defense against modern forgery in the signed-book market.
Why should I trust a dealer based in Spain rather than one in my own country?
Trust in the rare book market is not a function of geography — it is a function of expertise, accountability, and guarantees. We ship internationally with full insurance and professional packaging. Our books are listed on eBay, which provides an additional layer of buyer protection through eBay's Money Back Guarantee. Most importantly, we offer a lifetime guarantee on every book we sell: if any recognized authentication service refuses to certify a signature, we refund the full purchase price. No expiration date. No fine print. That guarantee is the strongest signal of confidence any dealer can offer, regardless of where they are located.
How many authors do you specialize in?
We specialize in approximately 20 authors divided into three tiers: five flagship authors (David Foster Wallace, J.K. Rowling, Noam Chomsky, Haruki Murakami, Kazuo Ishiguro) whose signed works we hold in greater depth than any other dealer, thirteen specialty authors including García Márquez, McCarthy, Thompson, Didion, Vonnegut, and others, and three additional authors (Crichton, Gaiman, Stephenson). Visit our collection page to learn about each author.
How long has Cervantes Rare Books been in business?
Cervantes Rare Books was formally established in 2024, though the expertise behind it reflects years of prior collecting, study, and authentication work. Our holdings — including over thirty authenticated signed first editions of Infinite Jest alone — represent an accumulation of knowledge and inventory that long predates the formal business. Our name honors Miguel de Cervantes, whose Don Quixote embodies the tension between appearance and reality that defines the authentication challenge.
What does it mean that you donate 10% of revenue, not profits?
Donating a percentage of revenue is a significantly stronger commitment than donating a percentage of profits. Profits can be reduced to near zero through expenses, reinvestment, and accounting — making a "percentage of profits" pledge potentially meaningless. Revenue is the total amount we take in before any deductions. Our 10% revenue donation to the National Pediatric Cancer Foundation is processed directly by eBay through the eBay for Charity program, ensuring complete transparency. Every dollar you spend includes a dime going directly to childhood cancer research.
Do you deal in any books outside your specialty authors?
Occasionally, we encounter exceptional signed books outside our core roster that meet our authentication standards. However, we will never sell a signed book by an author whose hand we haven't studied extensively. Our author roster defines the boundaries of our expertise, and we believe those boundaries are what make our authentication meaningful. If you have a signed book by an author we don't cover, we're happy to refer you to a specialist who focuses on that author.
Why is your company named after Cervantes?
Miguel de Cervantes wrote Don Quixote, the foundational novel of Western literature — a story about the gap between what things appear to be and what they actually are. Quixote mistook windmills for giants. The modern signed-book market, in our view, makes analogous mistakes: mistaking certificates for certainty, mistaking volume for competence. We chose the name as a reminder that our work exists at the intersection of appearance and reality, and that our value lies in seeing what others miss.
Can I build a relationship with Cervantes Rare Books as a regular collector?
Absolutely. Our most rewarding work is with collectors who return to us over time as they build their libraries. We can alert you when specific titles or authors become available, offer guidance on collection strategy, provide first refusal on new acquisitions before they reach the open market, and help you develop your eye for quality and authenticity. Reach out to us — whether you're a seasoned collector or just beginning, we welcome the conversation.
Start a Conversation
Whether you're building a collection, seeking authentication guidance, or looking for a specific title, we'd welcome the opportunity to help.