Missing letters are due to grease filled die strikes. Also circulation wear and tear. Also Environmental Damage. Your Quarter was exposed to a corrosive chemical that wore down the middle copper core. Worth? 25 Cents
Yep, environmental damage. No added value and a really ugly coin now. Spend it quickly. BTW welcome to coin talk where the collector can learn a lot from experienced members. And it's free knowledge so no educational loans to pay off.