Currency rating companies
What are the ratings of currency valuation companies?
Currency rating companies have different ratings, just like hotels, airlines, and any service-oriented organization. We only need to examine the image attached to the post to realize the magnitude of the difference between 9 coins that all received a rating of 65 from 9 different companies! The two best companies in the world in the field of rating are PCGS, the oldest, and NGC, which has recently valued a larger number of coins. Which is better is something that comes down to the hobbyist, as some prefer one over the other. But the most important thing for rating companies is consistency and stability, meaning that a coin that received, for example, 61 cannot later receive 65 (which is the test that major traders, associations, and interested magazines conduct from time to time by resending the same pieces many times to ensure the consistency of the results).
In second place are companies like ANACS and ICG, which are usually known for their accurate valuations. However, their limited experience with non-US coins may affect their assessments. Then there's NNC, founded by a Florida-based American dealer who became incredibly wealthy. He typically valued coins with scores ranging from 3 to 11 points higher, which ultimately led eBay to prohibit the mention of NNC's grading scores in any auctions, whether in the auction title or on its own page. (It's worth noting that eBay, the American Numismatic Society, and the Smithsonian Institution selected NNC as a company...) NGC As the only accredited valuation company to evaluate their currencies.
There are dozens of other companies such as ACG, ACGS, DGS, GCS, NTC, PNCS, SEGS, TGS, for example, but most of them work in the field of evaluating non-Arab currencies, and therefore they rarely appear on the scene.
Appraisal in general emerged to help in a simplified way to explain the condition of each coin – especially those offered in international auctions – and it has come a long way so far in this field. However, the collector must always remember that appraisal is 3/4 science (the strength of the luster, the strength of the mint, and whether all the details of the coin are present or not) and 1/4 personal opinion (which is how beautiful the coin is, eye appeal). However, most collectors will emphasize only one thing: buy the coin and don't buy the plastic appraisal certificate!
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