It will fit a 401, 403, 404 or a short bed 301. I'm not 100% sure if the 500 series machines will fit. I have one and use either my 301 or my 404 in it depending on my mood. They are great for the portability. I won't part with mine.
The featherweight tables usually have black legs and trim around the table top. Usually. Nothing with Singer or Shade Tree refurbishers is carved in stone.