$3.00 just for the silver.
1/4 of a dollar
No "S" mintmarks on a 1961 quarter, only a "D". The coin is valued for the silver, about $5.00.
1974 S (Proof) Quarter is worth $1.50.
Because of the silver content in the dime, quarter(s) and half dollar.
It's likely a printing error
1/4 of a dollar
$3.00 just for the silver.
No "S" mintmarks on a 1961 quarter, only a "D". The coin is valued for the silver, about $5.00.
1974 S (Proof) Quarter is worth $1.50.
3000 Dollars
it costs about 95 cents if perfect condition
A coin in average circulated condition has a retail value of $7.00-$15.00.
Because of the silver content in the dime, quarter(s) and half dollar.
If the coin is a silver proof still in collectible condition, retail value is about $8.00
With no mint mark and in average condition, about a dime. With a "D", about a quarter. With an "S", around 35¢
Assuming your silver proof quarter does not have any visible nicks or scratches, it is worth $3-$4 -- otherwise it's worth about $1 (Deleted my previous update. Since the S mint mark only appears on proof coins this could not be a circulation strike. The first answer above is correct as it stands.)