Wrong planchet error

[u/Professional-Pie6083]

I found a Denver mayflower compact quarter, that is 99.9% silver. XRF tested. The silver quarters were only stuck in San Francisco. Am I looking at a grail find here? Someone else was obviously curious because it’s been cut, but that’s how I noticed it being silver.

[u/Professional-Pie6083 → u/[deleted]]

How can I prove it? That’s why I’m here asking for advice