Wow. That's some history. I don't think I have any heat rings but I'm not sure what they look like.
Well damn those are some good looking skillets. Yeah mine doesn't have a heat ring. I like how they're numbered. It looks like their numbered by their creation date.
Must be some factory code, like year of that series+work week or the likes. I didn't try to decode mine (if it's explained in the article), just skimmed the pictures until I found a match and production period for that series.
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