Help me identify this insulator!

I was advised to ask this site for any help in identifying this porcelain and metal insulator. I collect glass insulators, so I don't know much about the porcelain side of the hobby. I have been looking online, and I can' find any information about it. If anyone could tell me what it was used for, who made it, it's age, or you know ANYTHING about this item, it would be very appreciated. Please email any information to me at jeffking1970@icloud.com