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Originally Posted by Walter  Sorry but I seem to remember that some of the TM's felt there was a mouthpiece make that was a better fit than most....when taking into account the mouthpiece receiver of what is now a vintage horn. Gap was also another issue...perhaps I didn't make myself perfectly clear! Of course I realise there is no best mouthpiece......by what I have described hopefully more clearly I will get some wise words. I have a Recording coming later this week and of course will try my Monette mouthpieces but if the shank is too small or too big the gap will be an issue. ROWUK......I wasn't asking for the best mouthpiece in the world...it was qualified with "for an Olds Recording"  If I'm still out to lunch on this I will take my 30 lashes with a wet noodle. 
Walter |
Although I know nothing about an Olds Recording, I have read 2 things that could be what you are talking about.
First, some very old trumpets have what are now considered non-standard mouthpiece receivers, so that modern mouthpieces don't fit. I read about one man who said that he had to experiment and found one old cornet mouthpiece that would finally fit his very old trumpet.
Second, even on the older trumpets that did have what were considered standard mouthpiece receivers, the mouthpieces of those times had a different shank taper so that might affect how the modern mouthpieces with modern taper would fit those older mouthpiece receivers. One man who wanted a duplicate made of his old mouthpiece said that the shop called saying "Did you know that your old mouthpiece shank has the old rather than the new taper?"
Is either of those what you are referring to?
- morris