Are you not in the US? It's from the State Quarters Program. https://www.usmint.gov/learn/coin-and-medal-programs/50-state-quarters
Quarters were plated with gold, silver and I believe platinum outside of the US Mint and sold as a novelty item. They are considered damaged with no extra value beyond 25 Cents
it's worth about 25 cents, plus or minus. Or just plain 25 cents. ignore any discolorization or Post Mint Damage.