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https://forum.saxontheweb.net/showt...ge10&highlight=Otto+link+identification+chartPlease help!
https://theowanne.com/knowledge/mouthpiece-museum/otto-link-mouthpieces/
Bottom line, personal perspective: If you don't know how to identify vintage mouthpieces, don't pay vintage prices. If it doesn't play well, "vintage" doesn't matter - you'll either have something to admire and brag about, or you need to get it refaced and it is no longer original.