Authentication is crucial to buying and selling rare coins. Dealers use various methods to ensure that coins are genuine and not counterfeit.

• Coin grading and certification: Trusted grading organizations like PCGS and NGC authenticate and grade coins based on their condition and authenticity.
• Visual inspection: Experienced dealers can spot distinguishing features or flaws in a coin that confirm its authenticity, such as specific mint marks or design details.
• Scientific testing: Some dealers use advanced technology to perform tests that determine a coin's composition and age, further confirming its legitimacy.

An authentic coin has both market value and historical importance, making it essential to work with a rare coin dealer who follows rigorous authentication processes.

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