25 cents.
Coins that are almost 40 years old have likely experienced a lot of wear. Depending on how they've been used, the reeding can be almost totally worn off.
The value of a 1971 quarter with an error depends on the type and rarity of the error. Common errors can be worth $50–$200, while rare ones may fetch thousands.
Face value only.
Kennedy Half dollars are very common, coins from 1971 to date contain no silver and are only face value.
There's no such coin. All circulation quarters minted in 1965 and later are made of copper-nickel, just like dimes dated 1965 and later, and half dollars dated 1971 and later, as well. Anything you find in change with those dates will be worth face value only.
Currently around $8.
25 cents
The coin is not silver and just face value.
It's worth 25 cents, because it contains no silver.
More than 300 million 1971 quarters were produced and any coin pulled from circulation has only face value.
25 cents. Huge numbers were minted and you can still find them in change somewhat often.
The value of a 1971 quarter with an error depends on the type and rarity of the error. Common errors can be worth $50–$200, while rare ones may fetch thousands.
Smooth - singer - was born in 1971.
492.75
The last silver quarters were dated 1964. Your coin is made of copper-nickel and is worth 25 cents.
Archie Manning, 1971 - 1982
Unless it's a proof or uncirculated coin in its original package, it's only worth face value. There are lots of these in circulation. Just look through your change for a few days.
If the coin is an Mint Error it needs to be seen to determine what type of error and it's value if any, so take it to a coin dealer for an assessment.