This is called a lamination error and occurs when one or both of the coin's cupronickel outer clad sides failed to bond properly to the copper core.
Currently, state quarter lamination errors are retailing in the $12 to $15 range.
The State Quarters series didn't start till 1999 so a 1998 SC quarter can't exist.
In any case any state quarter found in change is worth face value only because so many were minted.
None of the State Quarters found in change are worth more than face value.
No US quarter is dated 1782.
There were no quarter dollar coins issued by the U.S. mint in 1788.
No US quarters exist dated 1931.
Requires professional appraisal
A US quarter dated 1915 does contain 90% silver, so yes it is silver
The bicentennial quarter is extremely common, still worth 25 cents.
It's worth exactly 25 cents.
There are 5.625 grams of pure silver in every US quarter dated 1964 or prior.
A U.S. quarter dated 1965 or later weighs 1/5 of an ounce. Grab your calculator and go from there.
As of 22 January 2014, the melt value of a U.S. silver quarter (dated before 1965) is $3.58.
No U.S. coins dated 1966 have a mint mark. The '66 quarter is worth 25 cents.
All coins dated 1942 were struck IN 1942