Misjudging a coin’s condition due to inadequate knowledge.
Overlooking minor imperfections that affect value.
Ignoring professional grading services for high-value coins.
Misinterpreting grading scales and terminology.
Assuming that cleaning a coin will improve its grade.
Failing to account for market trends affecting coin values.
Relying solely on visual inspection without considering professional grading.
Not verifying a coin’s authenticity before grading.
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