I was a Scrimshander.
This is an Ivory disc a little over an inch and a half round. I etched into it by hand and then filled the scratches with india ink. It is called a scrimshaw. I haven't seen this one for over 25 years. Ran across it moving. I was never a writer. I actually worked in art and actually made a living for awhile with the scrimshaw and designing T Shirts.