These were Produced in red and peacock blue by VTS Industrial Co., distributors of telephone supplies, Salome, Arizona. These were made as an advertising item around 1977.

(front) "VTS INDUSTRIAL" (back) "NUMBER 8" -- smooth base with standard 1" threads. This version has a nice translucent red that passes light better than some. Only issue is a small potstone bruise at the wire groove on the side. Figure $125 plus actual postage.