The coin could not exist without the "copper filling". If you do not see the copper line on the edge of the coin it only means that the Nickel alloy has been "smeared" over it as the machine stamped out the blank planchet.
$ 7.93
2 mil
On eBay they're sold for $2.
25 cents, unfortunately, no more.
The silver value is about $6.00. NOTE: The US has never made a pure silver quarter, they are 90% silver & 10% copper.
Without a better description the value is 25 cents.
Quarters from 1983 are still worth 25 cents.
It's only 90% silver and 10% copper, value is about $3.00
As of May 24 2011 the melt value of a 1964 quarter is $6.47. This price will change as the price of silver and copper changes. This answer is based upon silver at a spot price of %35.77 per oz and copper at $4 per pound.
36 dollars
...25 cents. It is in common circulation, made out of copper-nickel and not worth any more than face value.
25 cents. All 1974 quarters were made from copper-nickel.