Button expert needed

[Tigerdude]

Found today. Partially says "colois" followed by what looks like "Rx". What say you.

 

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[fyrffytr1]

You might use a toothpick to clean the crud off. Or here's a trick I have used before. Heat the button in the oven at about 100 degrees then put it in the freezer. Sometimes the crud will pop off. I have even laid a find on the dash of my truck and let the sun heat it up before cooling it with the same result. With a more complete mark we might be able to help you. Or, someone here will identify it with the partial mark!