verifying vintage pickups


I found a pair of Filtertrons that someone installed in a Teisco et-220. I think they are vintage but I am not sure how to verify. I have them on sale on Reverb and Ebay so i want to be sure thye are the real deal. They measure 4.0k approx. How can I be sure.


FYI I listed the ebay auction so everyone could see all of the pictures.

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