I found this interesting Revere Ware percolator listed on eBay.
I’ve never seen this before. I can only imagine someone lost the original basket and adapted one that was used with a Pyrex percolator.
And sure enough, here is a Pyrex percolator with the same glass basket.
It may be the only one listed but I have seen other example solds with the pyrex stems. Not sure if it was ever offered this way or if this was a common swap.