Check for Mint Marks: Look for "S" for San Francisco mint coins.
Identify Silver-Clad Versions: Some quarters are made with silver and worth more.
Look for Mint Errors: Misprints can significantly increase value.
Examine Condition: Uncirculated quarters are more valuable.
Search for Proof Editions: Specially minted coins can fetch higher prices.
Know Key Dates: Some years have lower mintages and higher values.
Inspect for Unique Features: Double dies or other anomalies can indicate rarity.
Research Recent Sales: Compare with auction results to gauge value.
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