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please identify, is this a green board, is it a valuable one.

The board is in fact green :D

It's got a smaller board that appears to be low grade on its own that's attached to it, you could pull it after removing that screw.

The larger board is at least high peripheral with all the ICs.

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Here to learn more so I can recycle more
My grades are my own opinion and not an official grade from Boardsort

Key Reasons for Green

• Eye Comfort and Inspection: Human eyes are most sensitive to green light. This makes green the least fatiguing color for technicians inspecting tiny copper traces and soldering work for long hours.
• High Visual Contrast: Green provides sharp contrast against the white labels (silkscreen) and shiny silver solder joints, helping spot manufacturing errors quickly.
• Chemical Precision: The chemical formula for green solder mask has been refined over decades. It reliably creates tiny protective barriers called "solder dams" down to 0.1 mm in size, outperforming many other colored inks.
• Historical and Military Standards: The U.S. military helped standardize green in the mid-20th century because white text on a green background stayed legible under various lighting conditions.
• Cost and Mass Production: Because green has been the default industry standard for so long, supply chains produce it in the highest volume, making it the most cost-effective option.
Would you like to know how other PCB colors (like black, blue, or white) compare in cost and performance?
I got this from a google search.
I used to work manufacturing for awhile. When you are inspecting, repairing, and testing circuit boards for 8 hours. Eye fatigue is real.
Here to learn like everybody else.
My evaluations are my own opinion.