Check for the "S" mint mark indicating a valuable silver-clad quarter.
Look closely for double-die or other minting errors.
Inspect the condition—uncirculated quarters are worth much more.
Identify rare proof versions produced in limited quantities.
Use a magnifying glass to spot subtle design variations.
Find out if you have a Type I or Type II reverse, which can affect value.
Get the quarter professionally graded for an accurate valuation.
Compare your quarter to auction results for similar rare finds.
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