Proof Marks

[George Davis]

Does anyone know what is Proof Mark Means?

[Drew Hause]

Ignacio Ugartechea

https://photos.smugmug.com/Proof-Marks/i-NWWrhdN/0/L7gX6DJV9bLXfCp5FfQtVHfNNc2tb96vGhNLFpgvW/L/Screenshot%20%282470%29-L.png (https://drewhause.smugmug.com/Proof-Marks/i-NWWrhdN/A)

[George Davis]

Thank you