The cpu mystery solved ... I found out it is an old AMD cpu. To be more exact, it's an AMD Athlon with the serial number - AXDA2200DKV3C. I really have no idea what rate in speed it is but as it's already 12 years old what I see from the year on there. Too old anyway and likely not worth much. The ATX board is a socket T462 model.
Update: Google this morning to see what it is ... huh... so it's rated at 1800 MHz?

And yup, what I expected ... its worth is about $10 bucks! Not worth the headache to try sell it.