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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