- Stamped NPA 1979 7 in a circle on side of skirt
- Stamped NPA 1979 10 in a circle on side of skirt
- Stamped NPA 1979 11 in a circle on side of skirt
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Australian Telegraph Insulators
RandomAustralian insulators from communications lines. There are several different kinds that look the same at a glance, but they are very different. This shows some of the many kinds of Australian insulator. There are pottery, porcelain, glass and even...