They're not pure silver, they're 90% silver.
If you have common-date 90% silver coins in circulated condition, the price will fluctuate with the precious metals market. Currently, the spot price of silver is somewhere near $14 a troy ounce. At that price, the melt value of a quarter is $2.50, so a dealer should pay about $2 for a pre-65 quarter and sell one for $3. In large quantities ($1000 bags) the prices will be closer to the melt value.
The value is for the silver at $2.25 as of today.
it is worth about 50 dollars
No "quarter silver dollars" have been made by the U.S. Mint. Please post new question. Is it a quarter or a silver dollar?
about 134 dollars
Sorry! The US never made solid silver coins.
U.S. half dollars aren't solid silver. They're 90% silver with 10% copper, currently worth about $10.
Sorry! The US mint never made solid silver coins. It would be too hard.
It's not solid silver. U.S. silver coins have at least 10% copper in them. See the Related Question for more information.
from 500 dollars to 100 dollars depending if its p mint mark
any quarter prior to 1961 is currently worth at least 2 dollars in silver content
It is unlikely that you have a clad 1964 quarter, all quarters dated 1964 should be 90% silver, not the copper-nickel clad of 1965-present. Look on the rim of your coin, if it is a solid color (usually solid white but silver tones easily to different colors) it is silver, if it has a line of copper through it it is clad (compare it with a quarter from your pocket change). If it is clad, it is an error and worth quite a bit of money. If it is silver it is worth about $6 for the silver content.
They are worth 4-16 dollars in circulated condition. These coins contain 80% silver!
The US never made solid silver quarters. They would not be hard enough to stand excessive ware during circulation. They were made with a combination of 90% silver and 10% copper.