AU55/58 with staining from environmental exposure. That is not normal toning. imo…Spark edit to add: USA Coinbook lists a MS60 at $.69. Your coin will be worth 30 cents in about 5 years ( I consulted my crystal ball)
I assume you believed you found a quarter with missing clad. Sorry, just environmental toning and NAV, No Added Value.
The missing clad will almost always 100% be on one side only. If it was on both sides the coin would be incredibly thin and light and the pressure from the strike would not make a normal impression. It's just rusted. (Environmental damage.) Probably a metal detector find released into the wild. Even if it was missing on one side, the copper is often bright.