That's a tough one. I have been looking for you. Rudy Muck apparently worked with Vincent Bach and his trumpets are close copies. The bore may be the same. Why do you need to know?
I'm interested in finding out what the bore size is because, I"m looking to either find a Rudy somewhere or get a custom trumpet for bach. I think Rudy had his trumpets made from Blessing Trumpet Co.
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