Hopefully this will be helpful to you:
https://theowanne.com/knowledge/mouthpiece-museum/brilhart-mouthpieces/
Edit: Based on the way you worded your description, it looks like you've already read Theo's website (since your description mirrors what he has there). I don't know that anyone else on SOTW can help you any more than what you've already gotten from Theo's website. When you describe your mouthpiece (you'll have to sell it elsewhere as you are not allowed to participate in the marketplace here), you can simply reference that "based on Theo Wanne's website, this appears to be...." or something to that effect.
As for pricing, this would be your best resource (filtered by similar mouthpiece actually sold):
https://www.ebay.com/sch/i.html?_fr...onalin&_sacat=0&rt=nc&LH_Sold=1&LH_Complete=1
As is typically the case with "vintage" things, the earlier examples cost more than the later examples, so to the extent you don't find a Carlsbad era Tonalin in the eBay sold listings, you would at least know where your mouthpiece falls within the various price ranges.
That ligature might actually be worth more than the mouthpiece...
https://theowanne.com/knowledge/mouthpiece-museum/brilhart-mouthpieces/
Edit: Based on the way you worded your description, it looks like you've already read Theo's website (since your description mirrors what he has there). I don't know that anyone else on SOTW can help you any more than what you've already gotten from Theo's website. When you describe your mouthpiece (you'll have to sell it elsewhere as you are not allowed to participate in the marketplace here), you can simply reference that "based on Theo Wanne's website, this appears to be...." or something to that effect.
As for pricing, this would be your best resource (filtered by similar mouthpiece actually sold):
https://www.ebay.com/sch/i.html?_fr...onalin&_sacat=0&rt=nc&LH_Sold=1&LH_Complete=1
As is typically the case with "vintage" things, the earlier examples cost more than the later examples, so to the extent you don't find a Carlsbad era Tonalin in the eBay sold listings, you would at least know where your mouthpiece falls within the various price ranges.
That ligature might actually be worth more than the mouthpiece...
