The picture of the table had me confused for a few minutes because of the “ghost image” of the left “drop leaf”.
Anyway, I was curious about the top also and first thought it might be marble or something and then decided “
NAH”, that would be too heavy because one “slip” and that sucker would come off of there.
Anyway, I decided the top and the “drop leafs” are
black lacquered, aka:
Japanned or Japanning.
Just guessing though.