The value depends on the silver price, today it is worth around $4.94, but will change as silver prices change.
The net weight of pure silver is .18084oz for all silver Washington quarters
Assuming it's circulated and has no mintmark. Retail values run from $8.50 to $9.75 depending on the grade. But most are valued for the silver, about $5.00. A 1948 Washington quarter is very common.
About $3 for its silver content. A dealer will pay less.
The 1964 Washington Quarter has .18084oz of pure silver.
Value is $10.00 to $12.50 in MS-60 to MS-63.
It is 90% silver and 10% copper.
$3.00
$50
If you mean a 1966 American quarter, then none.
The coin is 90% silver and 10% copper not pure silver. The date is very common and circulated coins have retail values of $3.00-$4.00
Currently none.
$10