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Knox pocelain pin type insulator

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ThriftStoreA…'s likes119 of 236Suffolk, Holbrook and Tucker Boston Pig - BittersWWI Medal of Honor Recipient Photograph c. 1930s
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    Posted 13 years ago

    hm2169
    (1 item)

    I have a Knox Porcelain Crop insulator. I have been unable to find information about some of the markings as shown (BTC, 7 73, 7500). If someone knows what they are and possibly there value please let me know.

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