Don’t know much about these. Belonged to parents and they were in the home forever. There’s a partial sticker that starts with “ERCHTES”. Perhaps the first letter is missing as well and it said BERCHTESGADEN? Just a guess based on Googling. No makers mark or anything else I can see that would identify anything. No chips and they’re in good shape. Any questions let me know and I’ll do the best I can to answer.