They called them insulators. They kept power lines or telephone lines insulated from the telephone poles.
They are collectible but as far as value I wouldn't know much about it.
I feel like it's time for a little Wichita Lineman.
If I remember correctly the ones with with a greenish tinge to them are/were worth more. I believe that the thinly insulated wire (can't remember what was used at this time, I know it was paper at one point) was once wrapped around these.
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They called them insulators. They kept power lines or telephone lines insulated from the telephone poles. They are collectible but as far as value I wouldn't know much about it.
I feel like it's time for a little Wichita Lineman.