Red Wear Lamp.. looks like copper.but it,s ceramic

This lamp has the appearance of copper but it is made of a reddish clay..
It has the remnants of old wire and the finial seams to be made of slag.
the stem is some sort of metal and the cap is metal as well. I was thinking of rewiring it and using Edison bulbs in it, and skipping a shade.
Did this kind of lamp typically have a glass shade? That was my guess.
Thank you for looking.