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https://umek.pro/company/production for "Insulators - A History and Guide to North American Glass Pintype Insulators" consists of almost 13,000 entries listed by CD quantity, embossing and colour for each and every embossing. Each and every CD number has a scale drawing or photo to help with identification.
https://umek.pro/products/iec-standard/standard-profile has the numbers pretty much operating with each other as “21893”. Some of them are significantly thicker and heavier than their narrower “mold twins”. “1893” on a Script style moldThe “Prismic” embossing tends to have a additional angular look to the letters, with sharper corners and a crisp, “cut” greater-relief prism-like appearance in evidence.
Metal grading rings are at times added around the disc at the high v