I need an M-number for this one. It measures 11-3/4 In. tall and 11-5/8In. wide. Glaze is brown and is marked :4(B)3,this is sandblasted on the front crown I got this one from a line crew during the summer of 2002 as they replaced all the poles in a two mile section of a 10 mile line. The new poles have Lapp line-posts on them. Those new insulators weigh the same or more than this multipart. When the REA these were put up in 1949,the line voltage was 45 Kv. Today, the line voltage is 7200/12160 (Grounded Wye, If I remember right.)