- Use a Coin Magnifier to identify error coins, mint marks, varieties, imperfections. - American Numismatic Association recommends 5x-10x for. Coin magnifiers or coin loupes are essential tools when evaluating the quality of your coins or attributing varieties. When grading a coin, a coin magnifying glass. Free 2-day shipping. Buy 5x Folding Magnifier Loupe Coin Stamp Magnifying Glass at Walmart.com.

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