The Canadian RCMP quarter is from around the 1960's it is worth 25 cents in bad condition and $1.25 in mint condition.
1974 S (Proof) Quarter is worth $1.50.
The 1908-S Barber Quarter in the grade of G-4 has a retail value of $18.00.
Please post a new question with the date. Structure your sentence like this to ensure an answer- What is the value of a <date>S US quarter?.
Averge retail value is $2.00 for this coin.
$42
2 to 4 $
There were no S-mint quarters struck from 1955 to 1967 inclusive and no US coins carried mint marks during the transition from silver to clad coinage in 1965-67.
August 2, 2009 The 1968-S proof quarter has a value from $6 to $40 depending upon the actual condition of the coin.
Please see the Related Question for a detailed answer
Average market value is $51.25 in MS-66
If you found it in change, it's 25 cents. The retail value of a single proof is about a dollar.