Modern (~1965 or later) double-strikes can be fairly valuable because not many make it into circulation; they're usually caught by quality inspectors and removed before they leave the Mint.
However assigning a specific price is difficult because double-struck coins can be created in different ways. It's usually best to have an error coin evaluated in person by a dealer or appraiser who specializes in mint errors.
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Assuming you mean a quarter that is normally struck, but is missing the outer silvery-colored layer ... If it is a state quarter, these have been selling in the $300-$400 range. If it is an older quarter, these have been selling for about $50
This is a novelty or magic coin that has been altered and was not produced by the mint And has no collection value at all.
Could you check that date? Since 1965 quarters have not been struck in silver, only in cupronickel clad. Worth face value if it came from circulation, a buck or so if it came from a proof set ("S" mint mark). If your coin does not have a coppery-colored edge it might have been plated. But it's still only worth 25 cents.
If your coin is normal sized, then most likely it has been altered after it left the mint (probably to be used in a Magician's Coin), and has no added value. If your coin is odd shaped then it's likely that it got struck out-of-collar with two blanks in the press, a rare error worth over $100
Take it to a coin dealer it may have some value depending on if it's a error coin or has been mutilated.