This is the CD 126.4 that prompted my question. It has no embossing on the skirt. It has the W.E. MFG.CO. on the front crown. And W.U. on the rear crown. It also has markings in the top of the pin hole that look very much like those seen in B.F.G.Co. insulators. Could it possibly been manufactured by B.F.G.Co.?