Numismatic auctions KENDRO
Numismatic auctions KENDRO
GRADING: Professional assessment of coin quality and authenticity
15. February 2023

GRADING: Professional assessment of coin quality and authenticity

Investing in rare gold or silver historical coins is attractive to both experienced numismatists and the general public. However, for novice collectors without the necessary knowledge, it is very difficult to assess the true rarity of a coin, its numismatic value, condition, or even its authenticity. And that is a problem.

Rare gold coins are very expensive, and every investor needs to be sure that they have not spent their money on a period forgery or a coin in poor condition with many defects that significantly reduce its collector’s value. One possible solution to this problem is to purchase certified coins whose authenticity, condition, and numismatic value are guaranteed by a respected authority.

In this article, we will take a closer look at the entire process of professional coin grading, starting with an explanation of some basic terms.

GRADING – The English word GRADING could be translated as marking, classification, or sorting. In the field of collecting, it refers to the professional evaluation and determination of the condition of coins, banknotes, and other collectibles.

SLAB – This is the name of the plastic case in which the coin is enclosed and which cannot be opened without visible damage.

SLABBING – This is the process of encapsulation. The coin is professionally stored and enclosed in a plastic case (slab).

Expert evaluation and certification

The result of the expert evaluation of a coin and assessment of its condition is certification. The evaluation guarantees and declares that the collectible coin or banknote has undergone a thorough, multi-stage process of authenticity and condition verification. Each coin is checked and evaluated by several experts, independently of each other.

The coin classification process itself includes:

  • multi-stage verification of the coin’s authenticity (collectible item)
  • evaluation of the coin’s collectible condition
  • encapsulation in a special tailor-made plastic case that cannot be opened by standard means

The entire coin evaluation process is carefully and systematically monitored. Each coin is assessed in three (independent) stages of inspection. If necessary, an additional and final inspection of the coin is carried out by the most experienced supervisor of the certification authority.

It is important to remember that coin certification is carried out by a specific person and that each evaluation is therefore subjective to a certain extent. However, thanks to the high level of expertise, experience, and involvement of a large number of experts, coin certification can be considered an objective assessment of its condition.

Comprehensive coin inspection that misses nothing

Experienced experts focus on every detail when assessing a coin. Therefore, no repairs or surface changes to the coin escape their attention. The experts at the certification authority will detect professional removal of the ear or clip, as well as cleaning or polishing of the surface or additional modification of the year. Such fraudulent alterations to coins are intended to deceive less experienced clients. An example of this is the additional modification of St. Wenceslas ducats, where a counterfeiting workshop uses less rare St. Wenceslas ducats minted in 1933, modifies them, and passes them off as the rare 1930 edition.

Important notices:

Never remove the coin from its case

If the plastic case is damaged, whether due to improper handling or scratching, do not remove the coin from the Slab. In such a case, it is possible to send the case back for a so-called Re-GRADE, during which the coin will be placed in a new case with confirmation of the condition, quality, and authenticity of the coin.

Never clean or chemically treat coins

Coins undergo a triple inspection process. In the vast majority of cases, this will reveal any surface treatments applied to the coin, such as cleaning, patination, or chemical treatment of its surface. Any additional changes to the surface of the coin will be reflected in its final evaluation, naturally in a negative way.

Have your own coins appraised

Professional coin classification is not only useful for easily and safely purchasing coins of guaranteed quality. You can also use it to have your own coins professionally appraised, giving you certified coins whose condition, quality, and authenticity you won’t have to convince anyone of. Such coins are highly sought after on the collectors’ market, and the entire process of selling a coin is easier and faster thanks to certification. Professional certification will also help you better assess the market value of a coin – you can easily see the prices at which coins of similar quality have been and are being sold.

The coin evaluation process usually takes 7 to 8 weeks

The length of the coin evaluation process depends on the certification authority’s workload. Coins are sent to the US for classification, but in most cases the entire process takes no longer than 7 to 8 weeks, including shipping. Some collectors are reluctant to send their coins on such a long journey. Therefore, it is important to emphasize that all coins are fully insured according to their market value. There is therefore nothing to worry about. In the event of a coin being lost, although the risk of such a loss is minimal, you are 100% guaranteed to receive the full insurance amount for the coin.

Numismatic Guaranty Company – NGC®

One of the largest companies in the world for independent verification of authenticity and evaluation of the condition of coins is the American organization Numismatic Guaranty Company. Each coin that has been certified by NGC is assigned a unique barcode, which allows you to verify the coin and its authenticity using a special application. In addition to the barcode, the plastic case also features the coin’s designation (including the year of minting) and, most importantly, its grade. This is essential from a numismatic point of view and expresses the quality of the coin’s condition.

Are you interested in having your coin GRADED (professionally evaluated)?

Please contact us. We will first professionally evaluate your coin (not all coins are suitable for certification) and then recommend the next steps. If you decide to have your coin professionally graded, we will fill out a simple form together and add detailed photos of the selected coins. We will guide you through the entire certification process and advise you on shipping and insurance for your coins. We have been in the numismatics business for many years and are happy to share our wealth of experience with you.

Please do not hesitate to contact us for more information.

Gold and silver certified coins

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3 Krejcar 1820 B3 Krejcar 1820 Kremnica

3 Krejcar František I. 1820 B

Year of minting: 1820
Prize for KENDRO club members
€251
Standard price: €272
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2 Marka 1902 Baden2 Marka 1902 Baden.

2 Marka 1902 BADEN

Year of minting: 1902
Prize for KENDRO club members
€180
Standard price: €184
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20 Koruna 1910 Rakouská20 Koruna 1910 Wien

20 Koruna František Josef I. 1910

Year of minting: 1910
Prize for KENDRO club members
€1 882
Standard price: €1 966
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4 Dukát Ferdinand V. 18454 Dukát Ferdinand V. 1845

4 Dukát Ferdinand V. 1845 A

Year of minting: 1845
Prize for KENDRO club members
€12 548
Standard price: €12 757
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Rare vintage
Svatováclavský dukát 1935Dukát 1935

Svatováclavský dukát 1935

Year of minting: 1935
Prize for KENDRO club members
€2 050
Standard price: €2 091
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2 Dukát Leopold I. 1682 Graz2 Dukát 1682 Graz

2 Dukát Leopold I. 1682 IAN Graz

Year of minting: 1682/0
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€45 173
Standard price: €46 010
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