Prime condition, minting errors, and/or unique histories have contributed to massive resale value for quarters you may have lying around in an old change jar.
Most people remember seeing Bicentennial coins as kids, tucked into holiday card envelopes or sitting in a jar on grandma's dresser. They were special back then simply because they looked different.
The official Bicentennial logo, seen here on an 8-cent stamp issues in 1971, was a frequent site in the years leading up to the Bicentennial in 1976. (Public domain image) This strip of four 1976 ...