This is one of the Worden lamp forms
where they still supplied the Styrofoam form with the pattern printed on
the surface. Two forms for a 3 repeat lamp. I've made two lamps off this form. This has been covered with silicone to resist heat damage.
I didn't use the side pieces, I made a fixture to hold the two forms together and made the connections over the gap. All the pattern pieces are in numbered envelopes