The absence of a mint mark distinguishes this quarter as one of the rarest in existence.
Only a handful were mistakenly minted at the Philadelphia Mint without the customary "P" or "D" mark.
With its scarcity, collectors are willing to pay exorbitant prices, some exceeding the $10 million mark.
A minting error resulted in a double die impression on the reverse side of this quarter, making it a coveted item among numismatists.
The doubling effect enhances its uniqueness, driving its value to astonishing heights.
Proof coins are struck using specially polished dies and planchets, resulting in immaculate finishes.
A 1976 Bicentennial Quarter in flawless proof condition fetches considerable sums at auctions, particularly when accompanied by certification from reputable grading agencies.