Why did a 1970 quarter sell for $35000?

Could you explain why a seemingly ordinary 1970 quarter coin would sell for an astonishing amount of $35000? What makes this particular quarter so valuable and unique? Are there any special features or conditions that contribute to its high price tag? It seems quite surprising for a coin from such a recent era to fetch such a hefty price. I'm curious to learn more about the reasons behind this extraordinary sale.