I think it may be the knob off an oil or kerosene lamp.The size of a button it's solid
If the hole has or had threads, it could be a lamp finial.The size of a button it's solid
I was thinking along those lines, too..I was thinking the decorative nut that holds the globe on an old ceiling light.If the hole has or had threads, it could be a lamp finial.
Along those lines, something that held something in place that you may need to take apart & mend.I was thinking along those lines, too..I was thinking the decorative nut that holds the globe on an old ceiling light.