This is a quality wire frame in an unusual pretty scalloped flower bell shape for making a pleated/gathered or tailored soft bodied lampshade.
Base diameter 12” at the struts and 13” at the scallop peaks approx
Slope height 8”
Top diameter 6”
The final photo is an example I have made with this style of frame (in a larger size).
It has a uK BC fitting (approx 30mm).