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Knox pocelain pin type insulator

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Recent activity97721 of 109567ANTIQUE BARN LANTERN???? HELP1941 Keystone Mfg. Editing Outfit Model# 836 w/De Luxe Splicer for 8MM
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Posted 3 years ago

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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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