The 1976 No Mint Mark Proof quarter is one of the most coveted by collectors.
During the production of Bicentennial quarters, the U.S. Mint issued both copper-nickel clad and 40% silver-clad versions.
Occasionally, errors occur, resulting in silver-clad quarters that were not intended for circulation.
The double die obverse error is a fascinating phenomenon where the die used to strike the coin is misaligned, causing a doubled image.
A clipped planchet occurs when the blank metal disc used to strike the coin is not properly cut, resulting in a coin with a missing portion.