The so-called certificate of authenticity , often known as COA (Certificate of Authenticity) , is a term widely used in the autograph, sports memorabilia , and historical document markets. However, its true meaning and effective value are often misunderstood. To understand what truly protects buyers and sellers, it is essential to understand how a technical authenticity report works .

The authentication process is non-binary.

One of the main misconceptions about authentication is imagining that the answer is always "yes" or "no." In practice, authenticity is rarely absolute . It lies on a spectrum of certainty , ranging from 0%—when there is certainty of forgery, printing, or copying—to 100%, when authenticity is fully proven.

✔ The analysis is based on several criteria, mostly objective, such as:

✔ Graphological analysis of the signature,

✔ consistency of the medium (shirt, paper, object),

✔ period and materials used,

✔ Comparison with authentic reference specimens,

✔ Origin data available.

There are also subjective elements, such as experience, critical thinking, and professional intuition , developed over many years of specialized practice.

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Technical report vs. certificate of authenticity

For this reason, the most appropriate term is a well-founded technical opinion , and not automatically a "certificate." Only when the degree of certainty reaches 100% can a formal certificate of authenticity be issued.

In many cases, legitimate doubts remain—whether due to graphic inconsistencies or the absence or weakness of provenance , something quite common in the market. In these situations, the report reflects this reality in an honest, transparent, and responsible manner , without making artificial promises.

The value of the work lies not only in the final document, but in the methodology applied and the complete intellectual analysis , which constitutes a professional service independent of its outcome.

Is the COA recognized internationally?

In the autograph and memorabilia market, there is no single global authority whose certificates are automatically valid in all countries. What the market recognizes—both in Brazil and abroad—is the expert's credibility , reputation, career path, and the respect earned among their peers, major collectors, and industry professionals.

A Certificate of Analysis (COA) is not "worth it" because of a stamp or a business name, but because of the quality of the analysis , the transparency of the method , and the responsibility of the person who signs the report .

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The risk of certificates without technical analysis.

It is possible to find many certificates on the market issued only upon payment, without any real analysis. They are visually professional documents, but without technical arguments , without methodology, and without real value for experienced collectors or for the international market.

Issuing a certificate without presenting technical justifications is comparable to a medical diagnosis without examinations, history, or clinical analysis: it may seem convincing, but it has no scientific basis or real value.

What elements are analyzed in a technical report?

Assessing the authenticity of an autograph—whether on fabric, an object, or paper—involves a comprehensive and coherent analysis , including:

✔ Clarity and plausibility of the circumstances surrounding the item's production.

✔ Narrative coherence of the story associated with the play

✔ Known and documented chain of ownership

✔ Compatibility of support, handwriting, and content with the era.

✔ Availability of identical or very similar parts on the market

✔ Frequency of falsifications associated with the analyzed personality

Graphotechnical analysis

In analyzing the signature, the following aspects are observed, among others:

✔ writing instrument used,

✔ Ink color,

✔ Proportions, spacing, and letter shapes.

✔ continuity of stroke and line thickness,

✔ Fluency, spontaneity, and energy in writing.

Handwriting evolves over time and can vary according to age, emotional state, and circumstances (such as cold weather), making comparison with authentic examples from the same period essential.

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The Glorias Authenticity Assessment Scale

To reflect this spectrum of certainty, Glorias developed a five-level assessment scale , based on a multifactorial analysis that combines graphic, material, historical, and market aspects:

✔ Level 1 – Not authentic

✔ Level 2 – Probably not authentic

✔ Level 3 – Authenticity undetermined

✔ Level 4 – Very likely authentic

✔ Level 5 – Authentic without reservation

This scale does not represent a mechanical certification, but rather a degree of professional confidence , consistently applied to autographs on football shirts, objects, and historical documents.

Conclusion: What really protects buyers and sellers?

The true value of a technical report or certificate of authenticity lies not in the paper itself, but in the credibility of the expert , the robustness of the method , and the transparency of the analysis . This is what effectively reassures buyers and sellers , both in Brazil and in the international market.

This item is brought to you by the Glórias collection, specialists in rare autograph documents . We evaluate, buy, and sell letters, manuscripts, books with dedications or drawings by great historical figures. Click here to learn more.