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What Is A Mint Mark On A 1776-1976 Quarter? [Solved]

Wow! If you find a 1776-1976 quarter with an “S” mintmark, it’s worth way more than its 25 cent face value. It could be either a proof specimen or a 40% silver Bicentennial quarter, and if it’s uncirculated and rated MS 63, you can expect to get at least $5 for it.