What 1999 quarter is worth $10,000?

Could you elaborate on the specific 1999 quarter that is purportedly worth $10,000? Are there any unique markings or rarities that set this particular quarter apart from others minted in that year? What factors contribute to its significant value? Is it a rare error coin, a highly graded specimen, or perhaps a coin with a unique historical significance? Clarifying these details would help provide a more comprehensive understanding of why this particular 1999 quarter commands such a high price tag.