Recently got a No. 4 Cable CD 267. Found that most were used on the Boston Orange Trolley line that was started in 1899. The info stated that they were made by Brookfield and N.E.G.M.Co. Mine is of the dark aqua glass and is embossed with No. 4 CABLE and has no other markings. The upper half has no seam but the bottom half has the seam mark from the split mold. I have found a couple of pictures with N.E.G.M.Co. embossed insulators but they were not embossed with the No. 4 CABLE. Anyone have any idea who made the one I have?