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Anyone ever see a grey glass Sylvania 6sn7 before?

Posted by isaacc7 on September 2, 2021 at 19:26:33:

It was my understanding that other some super rare NU ones, all 7n7s were made by Sylvania and they tended to mimic their 6sn7 lineup. I assumed the 14n7 would be the same. I was happy to learn that they actually have the extra copper support like the super expensive metal base 6sn7 from Sylvania. And then there is these tubes. They have strange branding on them, never seen a sylvania logo like that before on a tube. Plus, these are grey glass, looking like the old RCA 6sn7. Anyone ever seen these before? They sound thick and warm, kind of bassy in my Supratek Cabernet.